Police in southern Germany are downplaying reports of an explosion near a refugee registration office, saying there is no sign the incident was a bomb attack by terrorists or anti-immigrant extremists.
Broadcaster Bayerischer Rundfunk reported the explosion in the town of Zirdndorf, near Nuremberg, in the southern state of Bavaria on the afternoon of July 27.
But police later said an aerosol can inside a suitcase may have caused the explosion. There were no injuries.
Germany is on edge following three brutal attacks in Bavaria -- the portal for tens of thousands of refugees.
On July 24, a 27-year-old suicide bomber and failed asylum seeker from Syria blew himself, wounding 15 people near a music festival in the town of Ansbach.
That attack was claimed by Islamic State (IS).
On July 22, nine people were killed in a shooting rampage at a Munich shopping mall by an 18-year-old German-Iranian man who is thought to have later killed himself.
On July 18, a 17-year-old asylum seeker believed to be from Afghanistan or Pakistan was shot dead by police after wounding passengers with an ax and knife on a train in southern Germany.