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David Cameron has said how "alarmed and shocked" he was to hear the news from Cumbria.
Twelve people have been killed, and twenty-five injured, by a lone gunman whose body has been found by police.
Speaking at the first Prime Minister's Questions of the new Parliament, David Cameron said that the Government will do "everything it possibly can" to help the community in Cumbria deal with the tragic loss of life.
And he added, "When lives and communities are suddenly shattered in this way, our thoughts should be with all those caught up in these tragic events, especially the families and friends of those killed or injured."
David was elected Leader of the Conservatives in December 2005 and appointed Prime Minister in May 2010.