French police patrol near the Eiffel Tower in Paris as part of the highest level of “Vigipirate” security plan after a shooting at the Paris offices of Charlie Hebdo January 7, 2015.

A police officer was killed and a street sweeper gravely wounded on Thursday after a man wearing a bullet-proof vest opened fire with an automatic rifle outside Paris, police said.

The attacker in the pre-dawn shooting Thursday remained at large, said French Interior Minister Bernard Cazeneuve.

Cazeneuve cautioned against jumping to any conclusions about the attack, which has not been linked to the assault on the satirical magazine Charlie Hebdo, which left eight journalists, two police and two others dead in Paris on Wednesday.

France is still on its highest level of alert after the deadly Charlie Hebedo attack.

In the Thursday shooting, the minister said the officer had stopped to investigate a traffic accident when the firing started. Paris police said the second victim was a street sweeper.

“There was an officer in front of a white car and a man running away who shot,” Ahmed Sassi, who saw the shooting from his home nearby, told the Associated Press.

He said the shooter wore dark clothes but no mask. “It didn’t look like a big gun because he held it with one hand,” Sassi said.

Cazeneuve left an emergency government meeting to travel to the scene of Thursday’s shooting.

There is no group that has claimed the attack.

[wpResize]