Sweden gunman's motives unknown five days after 10 killed

Swedish police said Sunday they are struggling to establish the motive of a gunman who killed 10 people at an adult education center in the country's worst mass shooting. Police confirmed the gunman was a former student at the Campus Risbergska in the central city of Orebro.

A top officer also said that police action had prevented an even higher toll. Police have not identified the gunman, who also died at the centre. Orebro police commander acknowledged that it was still not known what had sparked the killing spree on Tuesday. 

Police have previously said they faced "an inferno" when officers went to the education centre under attack. The gunman killed seven women and three men aged between 28 and 68. All lived in Orebro but different nationalities were involved. Swedish Prime Minister was due to speak to the nation about the shooting crisis on Sunday evening.