London's police force have stepped up patrols in response to the shooting at a gay nightclub in Orlando, but had no intelligence to suggest an increased risk in the British capital.
America's presidential rivals offered sharply different approaches for tackling extremism, with presumptive Republican nominee Donald Trump accusing Muslims of failing to report potential terrorists in their midst.
The top Democrat on a congressional intelligence committee said local law enforcement believed the suspect in Sunday's deadly Orlando shooting had pledged allegiance to the Islamic State militant group.
