Slovakian intelligence told their Austrian counterparts in July that the man who fatally shot four people in a terror attack in Vienna this week had tried to buy ammunition there and mistakes were apparently made in dealing with that information, Austrian authorities conceded Wednesday. The suspect, identified as 20-year-old Kujtim Fejzulai, had a previous conviction for trying to join the Islamic State group in Syria and had been given early release in December. A full assessment of copious video evidence has confirmed that he was a lone assailant, Interior Minister Karl Nehammer said.