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This is the horrifying moment shots ring out in broad daylight as a gun-wielding attacker opens fire on police.

The attack, in Baton Rouge in Louisiana, has seen three police officers killed.

A witness told WBRZ News 2 that a man dressed in black and with his face covered began shooting indiscriminately after walking out of a convenience store and car wash.

In the footage, several gunshots can be heard ringing out one by one. Then a dramatic flurry of shots can be heard as the shootout intensifies.

Other vehicles can be seen speeding away for safety, with another video showing a SWAT team vehicle racing towards the scene.

(Image: WAFB)

Follow our blog for live updates on Baton Rouge here

He told CNN: "There is still an active scene. They are investigating.

(Image: Reuters)

"Right now we are trying to get our arms around everything. It's just been one thing after another."

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Twitter user Kelsei LuBom, who is from Baton Rouge, wrote: "Whoever it was they was shooting indiscriminately.

(Image: REUTERS)

"My aunt is a emergency nurse at the lake (an apparent reference to Our Lady of the Lake Regional Medical Center) & she told me at least 6 are there now."

(Image: REUTERS)

She later added: "To my knowledge they've caught one!"

The incident began at around 9am local time between Baton Rouge Police Headquarters and the I-12 road.

A very large manhunt began immediately.

(Image: WAFB) (Image: REUTERS)

Mayor Holden added: "We're asking citizens to stay away from that area. And as it's Sunday we're asking people to pray for the families and officers."

(Image: @BikoTheGreat/twitter) (Image: REUTERS)

Tensions are high in Baton Rouge after the killing of 37-year-old Alton Sterling by police.

(Image: REUTERS)

However no clear motive for the shooting has yet been established.