The "recluse" suspected to be behind Sweden's worst mass shooting in history reportedly changed into military gear in the school's toilet before killing ten people. Rickard Andersson, 35, has been accused of carrying out a horrifying rampage at the Campus Risbergska in Orebro - but the gunman made a mysterious choice during his killing spree on Tuesday. Police believe the suspected killer turned the weapon on himself but his motive was not immediately known.

Chilling new details have revealed the gunman reportedly changed into green military clothes in the school's toilet before unleashing his killing spree. A current police theory is that the suspect calmly walked through the school’s corridors taking his shots at people. The gunman however is said to have made a mysterious decision to walk past certain people while choosing to not to shoot them, according to Swedish newspaper Aftonbladet.

Cops did not immediately reveal the suspect's identity but his family painted an image of him as a loser recluse to local media. One family member said he was unemployed and had isolated himself from his friends and loved ones. The suspect - who is also said to have "extreme social phobia" - would always keep his hood up, cover his hands and mouth, and was dubbed a loser in school. Andersson legally changed his name from Jonas Simon in 2017 - to the shock of his family.

He reportedly grew up in Orebro with his parents and siblings in an affluent part of the city - before moving to nearby Storgatan after he finished school. One relative said: "We haven't had much contact with him in recent years. "As a child he was different but lively. He did well in school. "But in recent years he has had a hard time. He is not working.". Another family member shared how the suspected gunman had completely changed in recent years.

They said: "He's really a loner. He used to have a friend he hung out with a lot, but not now. He wants to be by himself. "He doesn't seem to like people.". The suspect didn't spend time with his family at Christmas as "he wasn't feeling well mentally". He was also repeatedly denied military service, documents from the Swedish National Service Agency show. The Swedish National Service said the reason he was never called up for muster was due to him lacking upper secondary school qualifications, newspaper Aftonbladet was told.

SWEDEN experienced its worst shooting in history when a gunman opened fire at an adult education centre on Tuesday. The alarm was sounded around 12.30pm at the Campus Risbergska School in Orebro, around 200km west of Stockholm. At least 11 people are believed to have been killed and police believe one of these in the gunman. The shooter reportedly turned the gun on himself after his horror rampage. Police identified their suspect as 35-year-old Rickard Andersson.

Cops added that they believe he worked alone and have not confirmed his motivations. Authorities said six people were being treated in hospital - four women and two men. Five of these people have required surgery and two remain in a serious condition. Cops also said the death toll and number of injured could rise as they carry on with their investigation. Swedish Prime Minister Ulf Kristersson said Tuesday's attack was the worst in the country's history and called it a "painful day".

During the massacre, the suspect was believed to have been carrying three rifles - including a standard hunting rifle with 30-06 caliber ammunition. Some reported have claimed a shotgun was also used during the shooting spree. Authorities said six people were rushed to hospital and two of them remain in an intensive care unit. The identities of the killers victims have not been revealed. Although cops revealed they believe the suspect acted alone they have not ruled out the possibility of other suspects being involved.