( CNN ) Gunmen fired on police in a suburb of the southern French city of Marseille on Monday , the prosecutor 's office said . Shots were directed at a police car , and police returned fire , according to prosecutors . There were no immediate reports of casualties . A SWAT team was sent to the scene . The gunfire erupted in Castellane , a suburb in northern Marseille that 's known for its drug-related activity . France has been under a heightened state of alert since last month 's terror attacks in Paris that killed 17 people . French Prime Minister Manuel Valls is scheduled to be in Marseille later Monday .
The gunfire was reported in a suburb of Marseille in southern France . A police officer stands guard at the scene where two people were killed and several injured after an attack on a holiday party near Cannes, France, July 22, 2016.