The governor of the north-central US state of Minnesota on Thursday denounced the shooting of a black man by a police officer during a traffic stop as racially motivated.

"Would this have happened if the drivers and the passengers were white? I don't think it would have," Governor Mark Dayton said in a press conference.

The US Justice Department was monitoring a state investigation of the shooting of Philando Castile, 32, near Minneapolis, Minnesota, days after the launch of a federal investigation into a similar incident in the southern state of Louisiana.

"The department is prepared, as necessary, to conduct further investigation and consider this matter under applicable federal law," it said in a statement.

Dayton has asked the Justice Department to begin an immediate independent investigation into Castile's killing.

Castile was shot four times by an officer late Wednesday as he tried to get out his wallet after being pulled over for a broken tail light, police said.

His fiancee, Diamond Reynolds, recorded the aftermath using Facebook Live, as Castile bled profusely while the officer continued pointing his sidearm at him. Castile later died at the county hospital.

During the traffic stop before the shooting, Castile informed police that he had a permit to carry a concealed weapon and was armed, Reynolds said.

Her 4-year-old daughter was in the back seat of the car during the entire incident.

Dayton stressed that state authorities were taking the incident very seriously and said it appeared that Castile had not done anything to provoke the police officer. He expressed horror that the man had not been given first aid on the scene and that Reynolds and been handcuffed and taken to the police station.

"Nobody should be shot and killed for their tail light being out. Nobody should be shot and killed in the seat of their car," he said.

The officer involved has been placed on paid administrative leave, said Jon Mangseth, interim police chief in suburban St Anthony, Minnesota.

Castile's death comes a day after the death of Alton Sterling, a 37-year-old black man shot by police in Baton Rouge, Louisiana, after officers responded to a complaint about a black male selling CDs and threatening the caller with a gun. The US Justice Department said Wednesday it would investigate Sterling's killing.

Both deaths sparked outrage on social media and calls by civil rights leaders and politicians to address the issue of police brutality against African-Americans.

"I am horrified that we are forced to confront yet another death of a young African-American man at the hands of law enforcement," Minnesota Senator Al Franken said. "They deserve nothing less than a full and independent investigation into Philando's death by the Department of Justice."

US President Barack Obama said that he has faith that the Justice Department will conduct a fair civil rights investigation.

He called for implementation of the recommendations made by the task force he assembled on community policing practices after the shooting death of Michael Brown two years ago in Ferguson, Missouri.

"Regardless of the outcome of such investigations, what's clear is that these fatal shootings are not isolated incidents," Obama said in a Facebook statement Thursday. "We can and must do better to institute the best practices that reduce the appearance or reality of racial bias in law enforcement."

Latest news

Two charged for racially insulting actor Jamie Foxx in Dubrovnik

Dubrovnik police will bring misdemeanour charges against two men for disturbing the peace on Sunday night in a local restaurant when they racially insulted African American actor Jamie Foxx, who is currently in Dubrovnik filming "Robin Hood: Origins".

Opposition youth leader arrested in Zimbabwe

Zimbabwean police on Monday arrested an opposition youth leader on charges of inciting public violence against the government of President Robert Mugabe, the youth leader’s lawyer said.

Turkey dismisses 227 judges and prosecutors

Turkey's top judicial body on Monday dismissed 227 judges and prosecutors who are accused of having links to a cleric blamed for last year's coup attempt, the state-run Anadolu news agency reported.

Germany vows to do all it can to free journalist detained in Turkey

The German Foreign Ministry on Monday hailed German-Turkish journalist Deniz Yucel as a symbol of free speech as it vowed to treat his case with the "utmost importance" in order to secure his release.

Minister: State of education system not disastrous, Croatia leads in some indicators

Croatian Science and Education Minister Pavo Barisic has opposed assessments that the situation in the education system is disastrous, underlining that according to some indicators, Croatia is among the best European countries, as evidenced by the fact that as many as 97% of teachers attend seminars and lectures, a rate much above the European average.

Le Pen says al-Assad is better solution for Syria than Islamic State

France's far-right leader and presidential candidate Marine Le Pen said Monday that Syrian President Bashar al-Assad remains the more reassuring solution for France than Islamic State.

Residents in northern Greece oppose refugee children attending school

There were renewed clashes between angry residents and police in the northern Greek town of Oreokastro on Monday, where some locals have for months opposed children from a nearby refugee centre being taught at the local school.

Germany, France slam Russia's acceptance of Ukrainian rebel passports

EU member states Germany and France, which have been seeking to mitigate the conflict between the Ukrainian military and Russian-backed rebels in eastern Ukraine, on Monday broadly condemned Russia's recognition of rebel-issued passports.

Stier says Croatia strongly supports Kosovo, calls for enhancing economic cooperation

The Croatian minister announced a closer economic cooperation with Kosovo.

Afghanistan demands Pakistan hand over militants, shut training camps

The Afghan government has demanded that Pakistan hand over terrorists operating on its soil and close tens of terrorist training camps, the Foreign Ministry in Kabul said Monday.

Four Russian servicemen in Syria killed in vehicle bombing

Four Russian servicemen were killed and two others injured when a remote-controlled bomb exploded under their vehicle in Syria's western Homs region, Russian state media reported Monday, citing the Defence Ministry.

Iraqi forces advance in Mosul as US Defence Secretary visits Baghdad

Iraqi forces pressed on with their offensive to dislodge the extremist Islamic State militia from their stronghold in northern Iraq, as US Defence Secretary Jim Mattis landed in Baghdad on an unannounced official visit.