Security has been tightened in Hong Kong as lawmakers resume a debate over a bill that would make disrespecting China's national anthem a criminal offence.
The new law is seen as China's plans to impose national security laws on Hong Kong, with the UK stepping up criticism of the move.
Prime Minister Boris Johnson reiterated that Britain will not walk away from the people of Hong Kong and stressed that the national security law contradicts the 1984 accord.
He also repeated Britain's pledge to give British National Overseas passport-holders in Hong Kong a path to citizenship.
Meanwhile, Hong Kong leader Carrie Lam accused foreign governments on Tuesday of "double standards" and refused to back down.
It comes as the annual vigil to commemorate the bloody 1989 Tiananmen Square crackdown on pro-democracy demonstrators in Beijing has been cancelled.
One dead, several injured in Iranian attack on Manama building
Trump says war could be over soon, as Iran rallies behind new leader
Iran names Mojtaba Khamenei as new supreme leader
Indonesia says 7 killed in landfill collapse as rescue operation ends
