USA: Orlando nightclub killer Omar Mateen had expressed sympathy for a variety of Islamist extremists, including groups in the Middle East that are sworn enemies, the FBI said on Monday, as a picture began to emerge of the angry, violent man who carried out America's deadliest mass shooting.
U.S. authorities said they had found no direct links between Islamic State and Mateen, the U.S.-born son of Afghan immigrants who killed 49 people at a gay nightclub in Orlando on Sunday.