UK Embassy staff member, Damir Rovisan, was arrested on Tuesday due to his responsibility for the embassy's blast on Monday, said Wednesday Croatian police in Zagreb. In a release, the police said it was still investigating how Rovisan obtained the hand-grenade that exploded in the embassy's reception hall, adding that Rovisan claimed that he obtained the bomb for personal protection after receiving threats from Croatian mafia and that he did not mean for it to go off. He, however, failed to justify carrying such a weapon without informing his superiors at the embassy.The police said that Rovisan, who was a member of the embassy's security department, has links with organized-crime groups, but the embassy did not do any background check before appointing him. As the 28-year-old Rovisan was the only person injured in the blast, the Croatian authorities requested the permission of the UK Embassy to handle the investigations.