A person uses a mobile phone to record a protest against a proposed extradition bill in Hong Kong, China June 12, 2019. Tens of thousands of Hong Kong demonstrators surrounded the Chinese-ruled city's legislature on Wednesday, forcing it to postpone a second round of debate on an extradition bill that would allow people to be sent to mainland China for trial. REUTERS/Tyrone Siu

Protesters holding umbrellas occupy a street near a row of police officers outside the Legislative Council building during a demonstration against a proposed extradition bill in Hong Kong, China June 12, 2019. The protesters, most of them young people dressed in black, erected barricades as they prepared to hunker down for an extended occupation of the area, in scenes reminiscent of pro-democracy "Occupy" protests that gridlocked the former British colony in 2014. REUTERS/Thomas Peter

Protesters march along a road demonstrating against a proposed extradition bill in Hong Kong, China June 12, 2019. Protesters rallied in and around Lung Wo Road, a main east-west artery near the offices of embattled Hong Kong Chief Executive Carrie Lam, as hundreds of riot police, some armed with batons and plastic shields, warned them to stop advancing. REUTERS/Athit Perawongmetha

A protester mounts a metal barricade during a demonstration against a proposed extradition bill in Hong Kong, China June 12, 2019. "Didn't we say at the end of the Umbrella movement we would be back?" pro-democracy lawmaker Claudia Mo said, referring to the name often used for the "Occupy" demonstrations. "Now we are back!" she said as supporters echoed her words. REUTERS/Tyrone Siu

A protester holds a placard reading "Against China extradition" during a demonstration against a proposed extradition bill in Hong Kong, China June 12, 2019. Opposition to the bill on Sunday triggered Hong Kong's biggest political demonstration since its handover from British to Chinese rule in 1997 under a "once country, two systems" deal guaranteeing it special autonomy, including freedom of assembly, free press and independent judiciary. REUTERS/Tyrone Siu

Protesters march along a road demonstrating against a proposed extradition bill in Hong Kong, China June 12, 2019. But many accuse China of extensive meddling since then, including obstruction of democratic reforms, interference with local elections and of being behind the disappearance of five Hong Kong-based booksellers, starting in 2015, who specialised in works critical of Chinese leaders. REUTERS/Athit Perawongmetha