The Pakistan Prime Minister visited the scene of a double suicide attack in the eastern city of Lahore yesterday as angry protesters around the country demanded action against extremism. Yousuf Raza Gilani visited the shrine and vowed to defeat extremists, saying he has convened a special law enforcement meeting to work out a solution.Police said they have apprehended several people in Lahore in their investigation into Thursday's bombings. Forty three people were killed in an explosion at a packed Sufi shrine. No formal arrests have been so far, officials said.