A WENDY's restaurant where a cop fatally shot a black man appears to have been set ablaze by a masked white woman, according to bystanders videoing the fire.

Black Lives Matter vowed "it wasn't us" as Atlanta police offered a $10,000 reward to help find those responsible for the inferno that destroyed the controversial food outlet during weekend protests over the death of Rayshard Brooks.

The restaurant was in flames for more than 45 minutes before fire crews arrived to extinguish the blaze, protected by a line of police officers, local TV showed.

By that time the building was reduced to charred rubble next to a gas station.

Protesters standing near the blaze condemned the woman for fanning the flames.

In video footage, they insisted Black Lives Matters supporters had not started the fire.

One man can be heard saying: "Look at the white girl trying to set s*** on fire.

"Look at that white girl trying to burn down a Wendy's.

"This wasn't us."

Eva Snow, who lives in the neighborhood and often ate at the restaurant, told Atlanta Journal Constitution she blamed the blaze on white supremacists.

Snow said she knew people who saw white people igniting it. 

But she defended the inferno, saying that Wendy’s deserved to be razed after opening for business hours after the death of Rayshard Brooks.

The Atlanta Police Department shared pics on Facebook of a masked woman they are seeking in connection to the blaze.

"Crime Stoppers of Greater Atlanta is offering a $10,000 reward for information that will lead to the arrest and indictment of the individuals responsible for starting a fire that led to the destruction of a Wendy’s restaurant at 125 University Avenue in southwest Atlanta during protests that began Saturday, June 13 and lasted into the morning hours of June 14," the force said.

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