LYON, France — A "low force" blast hit a busy pedestrian street Friday in the French city of Lyon, injuring seven people as it shattered the glass from a refrigerated shop cooler in a bakery, a local official said.

France's anti-terrorist office opened an inquiry into the blast and the anti-terrorism prosecutor, Remy Heitz, went to Lyon. The interior minister also was on site, and soldiers secured the area.

France is jittery over a spate of attacks in recent years, some of them deadly, carried out by people ranging from extremist attackers to mentally unstable individuals. Five people were killed Dec. 11 in an attack on the Christmas Market in Strasbourg, in eastern France. The alleged killer, Cherif Chekatt — killed by police — had pledged allegiance to the Islamic State group.

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