Elite French police units are being sent to a northern suburb of Marseilles after hooded gunmen fired Kalashnikov rifles at police, a police source tells Reuters. France is on high-alert for terrorism after the Charlie Hebdo killings and their aftermath, but Marseilles officials blame this incident on drug traffickers. “This battle against drug trafficking is a long-term battle,” Deputy Mayor Caroline Pozmentier said on Monday. A school has been evacuated and a section of the town, La Castellane, has been cordoned off. Prime Minister Manuel Valls is visiting Marseilles on Monday.