Austrian police have arrested 14 people in raids linked to Monday's deadly attack in Vienna and have found no evidence that a second shooter was involved, Interior Minister Karl Nehammer said Tuesday. "There have been 18 raids in Vienna and Lower Austria and 14 people have been detained," Nehammer told a televised press conference. The minister added that police believe that the attack in central Vienna was carried out by a lone gunman, Kujtim Fejzulai, a 20-year-old Islamic State sympathiser who was killed by police on Monday night. The video material evaluated by the police "does not at this time show any evidence of a second attacker," Nehammer said. Fejzulai, a dual Austrian and Macedonian national, was convicted of a terror offence in April last year for trying to travel to Syria. Nehammer said he had been on a de-radicalisation programme and had managed to secure an early release. "The perpetrator managed to fool the de-radicalisation programme of the justice system, to fool the people in it, and to get an early release through this," the minister said. jsk/lc/adp