Two people were killed and at least 12 were injured in the shooting in central Strasbourg, some of them critically. A third victim died Thursday in hospital.

The gunman, who has been identified as 29-year-old Chérif Chekatt, exchanged fire with security forces but remains at large. The Paris prosecutor said Chekatt has a long criminal record with 27 convictions in France, Germany and Switzerland.

France has increased its terror alert level and sent extra security forces to Strasbourg as well as tightened security at borders and Christmas markets.

The shooting started near Place Kléber and advanced toward the Rue Des Grandes Arcades, one of the city's main shopping streets.

Several areas went on lockdown, with members of the public taking shelter inside bars and restaurants.