A balloon for each of the 49 victims of the Orlando nightclub shooting has been released into the sky above Soho during a vigil attended by thousands.
Huge crowds gathered in and around Old Compton Street for London Stands with Orlando.
Venues in the area encouraged customers to join the vigil, which started at 7pm.
A Facebook page set up for it saw almost 6,000 say they would attend, but City Hall officials estimate 20,000 people came onto the streets.
Forty-nine people were killed and a further 53 hospitalised when Omar Mateen opened fire inside Pulse, a gay nightclub in Orlando, in the early hours of Sunday.
It is the worst mass shooting in American history.
Police carried out patrols in Old Compton Street and its surrounding areas last night.
They said the patrols were to reassure people.
London Mayor Sadiq Khan, who was launching Pride in London's No Filter campaign outside City Hall, said the city stands "shoulder to shoulder" with the victims and their families.