Police Friday raided a home in the Dallas suburb of Mesquite, Texas, where the slain suspect in a shooting attack that killed five police officers lived, police said.

Police identified the man as Micah Xavier Johnson, 25, a black military veteran whom they believed carried out the sniper ambush in Dallas Thursday night on police guarding a protest against police violence. Fourteen people were shot, including two civilians.

Johnson told negotiators he was the only shooter, police said. Investigators now believe he acted alone, after earlier reports by police and witnesses in the chaotic hours following the attack had described a coordinated attack by several shooters.

Dallas Mayor Mike Rawlings said there had been confusion about the number of shooters because the gunman was moving during the attack.

US President Barack Obama was cutting short a trip to Europe to return home on Sunday to deal with the attack, scaling back his planned activities in Spain to return a day earlier than planned before traveling to Dallas next week.

"The president will continue the work to bring people together to support our police officers and communities, and find common ground by discussing policy ideas for addressing the persistent racial disparities in our criminal justice system," spokesman Josh Earnest said.

Police said they had arrested another 25-year-old man at the scene on what they described as "unrelated" weapons charges. Police had earlier said three people were in police custody, including one Rawlings earlier identified as a black woman.

Texas Governor Greg Abbott said authorities were working to identify any potential conspirators.

The US military confirmed that Johnson had served in the US Army reserve until last year, and had been deployed to Afghanistan from November 2013 to July 2014.

Police said a search of Johnson's home turned up bomb making materials, ballistic vests, rifles, ammunition, and a personal journal of combat tactics.

The attack just before 9 pm Thursday (0200 GMT Friday) began as officers were mowed down by sniper fire as the peaceful demonstration ended. A street-level shootout ensued, and police exchanged gunfire for hours with Johnson, holed up in a parking garage near the city's El Centro College.

Police said they killed him with a bomb carried by a robot into the garage - possibly the first time a robot has been used to kill a suspect, according to news reports.

The White House ruled out any connection to terrorism in the attack. In Warsaw for a NATO summit, Obama condemned the shootings as "vicious, calculated and despicable" and said "justice will be done."

Obama ordered flags lowered to half-mast in mourning.

But even as the violence united the country in condemnation, it once again laid bare ongoing tensions between law enforcement and the black community over violence and allegations of bias.

The slain police officers were guarding a demonstration by activist group Black Lives Matter protesting the killing of two black men by police elsewhere in the country earlier in the week.

Alton Sterling, 37, was shot and killed in Baton Rouge Tuesday and Philando Castile, 32, in suburban Minneapolis Wednesday. Castile's girlfriend live-streamed video as he died from four gunshot wounds, shot as he reached for his wallet to show a police officer who had pulled him over for a broken tail light.

Police said the Dallas shooter told negotiators he was angry about the deaths at police hands and about Black Lives Matter and wanted to kill white police officers.

"Racial issues continue to divide us. Yes, it's that word race and we have to attack it head on," Dallas Mayor Mike Rawlings said at an outdoor prayer service attended by hundreds of mourners in Dallas' Thanksgiving Square Friday.

"All I know is this must stop. This divisiveness between our police and our citizens," Dallas police chief David Brown said earlier in the day.

But in a sign of persistent divisions, Lieutenant Governor Dan Patrick lashed out at Black Lives Matter protesters, blaming their movement for violence against police and calling them "hypocrites" for seeking police protection from gunfire, according to the Dallas Morning News.

The attacks renewed calls by Obama and Democratic leaders for legislative action on gun control, which the Republican congressional majority have refused to allow.

"When people are armed with powerful weapons, unfortunately, it makes attacks like these more deadly and more tragic. In the days ahead, we are going to have to confront those realities as well," Obama said.

Democratic Representative GK Butterfield, chair of the Congressional Black Caucus, told media that without legislative action, the country's entrenched conflicts on race and guns could turn combustible again.

"If we fail to act, this will be a long, hot summer," he said.

Latest news

Syrian opposition rules out future role for President al-Assad

The Syrian opposition said Friday it would not accept any role for President Bashar al-Assad in the future of the war-torn country, reacting to a recent US shift saying that removing al-Assad is no longer a priority for Washington.

Russian Army integrates breakaway forces of Georgian province

Parts of the small fighting forces of the Georgian breakaway province of South Ossetia have been placed under Russian military control, Russian Defence Minister Sergei Shoigu said on Friday.

Czech Republic's Pilsner Urquell beer is now Japanese

Japanese brewing company Asahi completed its takeover of the Czech brewery Pilsner Urquell on Friday, Asahi said in a statement.

Judge approves 25-million-dollar settlement of Trump University case

A US district judge on Friday approved a 25-million-dollar settlement of lawsuits and state fraud allegations against Trump University, the US president's now-defunct business venture.

Former Thai premier Thaksin to junta on reconciliation: 'Cut me out'

Former Thai prime minister Thaksin Shinawatra on Friday announced that he is not interested in the junta-led reconciliation process, three days after the junta handed him a half-a-billion-dollar tax bill for his past business deal.

Dalic: We welcome possible deal between Agrokor and banks

The government welcomes the possibility of an agreement being concluded between the Agrokor food company and creditor banks, and the bill on vitally important companies is not a fallback plan but the result of the government's care for the overall economic and financial stability of Croatia, Deputy Prime Minister and Minister of Economy Martina Dalic told a press conference in Zagreb on Friday.

Croatia, China sign action plan for cooperation in agriculture

The Croatian and Chinese ministries of agriculture on Friday signed an action plan for cooperation in the field of agriculture for the period 2017-2018, the Croatian ministry said in a statement.

ZSE indices up, Agrokor shares in focus of investor interest

The Zagreb Stock Exchange (ZSE) indices on Friday rose by more than 1.8%, with stocks of the Agrokor food and retail concern being in the focus of investor interest again.

Berlin police defend handling of Berlin market attacker

Berlin police defended themselves on Friday against accusations that they stopped surveillance on Berlin Christmas market attacker despite knowing in June 2016 he was dangerous.

Croatia, creditors tailor emergency measures to save tottering giant

Croatia's tottering retail and food giant Agrokor reached an agreement with its creditors, putting its debts standby and allowing it to continue working during emergency restructuring, the Croatian branch of Austria's Erste Bank said Friday.

Agrokor's creditors say standstill agreement to go into force today

A standstill agreement regarding the Agrokor concern's existing financial obligations to banks will take effect on Friday, additional capital will be injected into the concern in the coming days and the concern will be actively restructured, which includes a change of its management, it was said on Friday after a meeting between Agrokor's suppliers and creditor banks.

Palestinians, UN slam Israel's new settlement plan

Palestinians, Israeli activists and the UN lambasted the government of Israeli Prime Minister Benjamin Netanyahu on Friday, a day after it gave the go-ahead for the first new West Bank settlement in a quarter of a century.

South Sudan rebels release three abducted foreign oil workers

South Sudanese rebels have released three foreign engineers they abducted in early March in the oil-rich Upper Nile region, Foreign Affairs Ministry official Mawein Makol Arik said on Friday.

Turkish opposition: Imprisoned party chief has gone on hunger strike

The head of Turkey's pro-Kurdish opposition party has launched a hunger strike from prison.

European leagues threaten Champions League schedule clashes

The European Professional Football Leagues (EPFL) on Friday threatened schedule clashes on Champions League matchdays in an ongoing dispute with the governing body UEFA.

Danish court revokes citizenship of IS volunteer

A Danish appellate court on Friday stripped a man of his Danish citizenship for volunteering to fight for the extremist Islamic State in Syria.

Banks and Agrokor agree on key elements of standstill agreement

Member banks of the coordinating committee of financial creditors and representatives of the Agrokor food company have in principle agreed on key elements of a standstill agreement, which is expected to be signed later today, announcing changes in the company's management team, Erste Bank said in a statement on Friday afternoon.

Syrian man on trial in Sweden; mosque attack labelled terrorism

A Syrian man went on trial Friday in the southern Swedish city of Malmo, charged with terrorism and arson after an attack last year on a building used as an assembly hall by Shiite Muslims.