Death toll rises to 4 in France's Strasbourg shooting (Lead)
"Our security and rescue services are mobilised," Castaner added.
According to sources from local authorities, the suspected gunman identified as 29-year-old and known to police for criminal activity, has been cornered. Police had reportedly exchanged gunfire with the suspect during the chase.
The Prosecutor's Office said French counter terrorism prosecutor has opened investigation into the incident.
Bordering Germany, Strasbourg is the capital city of the Grand Est region in northeastern France.
--IANS vc