Seven policemen have been shot with as many as three dead in the US city of Baton Rouge, Louisiana, a city spokeswoman has told US broadcaster CNN.

The shooting occurred when officers responded to a "suspicious person" with an assault rifle.

The area of the attack is "still an active scene," said city official Kip Holden, adding that there was as of yet no information as to a connection with the slayings of black men in the country that has increased tensions.

The five white policemen in Dallas were gunned down by a black assailant on July 7 at the end of a protest march. That march itself was a protest at the separate killings of black citizens by police, one of whom died at the hands of Baton Rouge police.

On Tuesday June 5, 37-year-old Alton Sterling was tackled and shot by police after selling CDs outside a convenience store in the Louisiana city.

The next day, Philando Castile, 32, was fatally shot during a routine traffic stop in suburban Minneapolis, Minnesota. Castile's fiancee recorded the aftermath using Facebook Live as her boyfriend bled profusely while the officer continued pointing his firearm at him.

The high-profile killings of black men by police followed by the recent slayings of police officers have sparked protests across the country and underscored disparities in the US justice system and racial divisions.

Among the tensions is the worry that further attempts on officers' lives could be made.

Last week in Baton Rouge, police arrested three individuals and recovered six firearms following a burglary in which one of the suspects threatened to use guns to kill police, the East Baton Rouge Sheriff's Office said Tuesday.

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