Sweden reeled Wednesday from the deadliest mass shooting in its history after 10 people plus the suspected gunman were killed in a shooting at an adult education centre in the central city of Orebro.

Several media reported the suspected gunman turned his gun on himself -- but police have not confirmed those reports.

"Eleven people are dead, including the killer," police told AFP about Tuesday's massacre at Campus Risbergska, a secondary school for young adults.

Local health authorities said Wednesday six people were being treated at Orebro's university hospital.

Five of them -- three women and two men -- had undergone surgery for gunshot wounds and were in a "stable but serious" condition.

A woman was also being treated for minor injuries, Orebro County authorities said in a statement, adding that all the injured were over the age of 18.

"This is the worst mass shooting in Swedish history," Prime Minister Ulf Kristersson told a press conference late on Tuesday.

Kristersson noted a lot of "questions were still unanswered".

"But there will come a........

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