David Cameron, the leader of Britain's Conservative Party, has urged Prime Minister Gordon Brown to take a stand on the Scottish justice secretary's decision to release the Lockerbie bomber on compassionate grounds. "It is curious that while others have commented, Britain's own prime minister has not," Cameron wrote in a letter to Brown. He said the "public are entitled to know" whether Brown thinks the release was right or wrong, and mentioned that Colonel Gaddafi's son has publicly thanked the British government, which raises "questions about the British government's role." Brown’s foreign minister has refused to comment on the decision. Scenes of Abdel Basset Ali al-Megrahi’s hero’s welcome at Tripoli airport on his return to Libya have raised outrage in the U.S.