Ansbach - Bavaria's top security official said on Monday that he believes a failed asylum seeker who blew himself up and injured 12 people in the southern German town of Ansbach was driven by religious extremism."My personal view is that I think it's very likely this really was an Islamist suicide attack," Bavarian interior minister Joachim Herrmann told German news agency dpa.The 27-year-old Syrian blew himself up after being turned away from an open-air music festival. Herrmann said the man's request for asylum was rejected a year ago, but he was allowed to remain in Germany because of the strife in Syria.The unnamed man had repeatedly received psychiatric treatment, including for attempted suicide, Herrmann said.Asked whether the bomber might have links to the Islamic State group, Herrmann said that couldn't be ruled out, though there was no concrete evidence for this yet."The obvious intention to kill more people indicates an Islamist connection," he told dpa.Earlier on Monday, a spokesperson for the prosecutor's office in Ansbach said the attacker's motive wasn't clear."Whether there is an Islamist link or not is purely speculation at this point," said the spokesperson, Michael Schrotberger.Roman Fertinger, the deputy police chief in nearby Nuernberg, said it was likely there would have been more casualties if the man had managed to enter the concert venue.Three of the 12 victims suffered serious injuries in the blast. The attacker's rucksack had contained sharp bits of metal.The explosion came as Germany, and the southern state of Bavaria in particular, have been on edge.Earlier on Sunday, a Syrian man killed a woman with a machete and wounded two others outside a bus station in the south-western city of Reutlingen before being arrested. Police said there were no indications pointing to terrorism.Two days earlier, a man went on a deadly rampage at a Munich mall, killing nine people and leaving dozens wounded.And an axe attack on a train near Wuerzburg last Monday wounded five. A 17-year-old Afghan asylum-seeker was shot and killed by police as he fled the scene.On Sunday, authorities said they were alerted to an explosion in Ansbach's city's centre shortly after 22:00.The three-day open-air concert was underway, with about 2 500 in attendance, when it was shut down as a precaution after the explosion. Jethro Tull frontman Ian Anderson was the scheduled performer.Bavarian public broadcaster Bayerische Rundfunk reported that 200 police officers and 350 rescue personnel were brought in following the explosion in Ansbach.The recent attacks in Bavaria, a picturesque, mountainous haven for travellers, came shortly after a Tunisian man driving a truck killed 84 people when he ploughed through a festive crowd celebrating Bastille Day in Nice, along the famed French Riviera.In Munich on Sunday evening, 1 500 people gathered at the scene of the shooting there, lighting candles and placing flowers in tribute to the victims of an 18-year-old German-Iranian. Police said that he had planned the attack for a year.After the Munich attack, Herrmann urged the German government to allow the country's military to be deployed to support police during attacks. Germany's post-war constitution, because of the excesses of the Nazi era, only allows the military to be deployed domestically in cases of national emergency.Herrmann has called those regulations obsolete and said that Germans have a "right to safety."Back in January, Bavaria's justice minister launched a state program in Ansbach meant to teach refugees the basics of law in their new host country. The initiative came amid growing tensions and concerns in Germany about how it would integrate the estimated 1 million-plus migrants it registered crossing into the country last year.Classes include lessons about freedom of opinion, the separation of religion and state and the equality of men and women."Germany is an attractive country because it respects the dignity of every human being," an educational film shown to newcomers said, "and it is supposed to stay that way."