BBC: Gordon Brown and David Cameron have clashed over plans to introduce identity cards in their first prime minister's questions encounter.
Mr Cameron, whose Conservatives oppose the cards, said they would "cause more problems than they solve" and had not stopped terror attacks abroad.
But Mr Brown, who raised the issue, said they were needed as they were "complementary" to other policies.
He called on all political parties to show "unity in the face of terror". Brown and Cameron clash over ID (more)
Mark Alexander
