Home Secretary Theresa May has said the government will "consider all the options" over gun laws after a taxi driver shot 12 people dead in Cumbria.
In a Commons statement on 3 June 2010, she told MPs it was "right and proper" to have a debate after the killings but warned it would be "wrong to react before we know the full facts".
She said police had confirmed gunman Derrick Bird was licensed to carry the weapons he used in Wednesday's attacks.
He killed 12 people and injured 11 more before turning the gun on himself.
Mrs May told MPs that more than 100 detectives were taking part in the investigation and would be looking into Bird's history, his access to firearms and the "motivation for his actions".
More than 30 police family liaison officers had been working through the night to identify the 12 people who were killed and notify their relatives.
She and Prime Minister David Cameron will visit the area on Friday.
Shadow home secretary Alan Johnson sent his condolences to the families and friends of those killed in the "awful, tragic" events.
Mr Johnson said the police emergency services had performed "magnificently".
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