UPDATE (From Ed): As always with shooting incidents, early reports can be chaotic and contradictory. However, Andrew Neil of the London Spectator tweets that “This is becoming a scandal. French media reporting gunman escaped this morning from a search carried out at his home in the district of Neudorf south of Strasbourg by gendarmes. Grenades were found on site by the gendarmes.”
The London Telegraph is currently reporting that “at least four people” have been killed, and that the gunman is still at large. “The authorities are treating the attack as a terrorist act. Anti-terrorist prosecutors have opened an investigation.”
[From a separate source]:
A statement by local French police says the [French national, Moroccan decent] shooter is from the notorious Neuhof neighborhood, a hub of Islamist radicalization and a known "no-go" zone.
It also states that he was categorized on their terror watch list as "fiche-S," meaning known to be a radicalized militant.