Something happened in prison to Omar El-Hussein, the 22-year-old identified by police as the gunman who killed two people in a weekend shooting spree in Copenhagen.

His transformation from small-time criminal to cold-blooded killer is fuelling a debate about whether a radicalised environment in Danish prisons is pushing smalltime gangsters into the arms of Islamic extremism.

"He was crazy. When he came out of prison he was totally nuts," said a taxi driver from the housing estate where El-Hussein lived and played as a child.

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