Hong Kong police fire water cannons into a crowd of people protesting against the new national security law.
Some can't even open their eyes because of the tear gas.
Arrests can be made for illegal assembly, obstruction, possession of weapons, and even chanting or waving independence flags.
On Wednesday, over three-hundred-70 people were arrested 10 under the new national security law including a 15-year-old girl.
"Probably in the future we may never see a million people on the street again, not because we are satisfied with the government but because we are now living in fear."
According to the South China Morning Post, the law targets crimes of secession, subversion, terrorism, foreign interferenceand carries a maximum sentence of life in prison.
Police officers have the power to search people's premises, vehicles, and electronic devices and can order suspects to surrender their passports to prevent them from fleeing the country.
Police officers can also ask offenders to delete any information that contravenes the law.
U.S. Secretary of State Mike Pompeo on Wednesday called Hong Kong "just another communist-run city" as he condemned China's new security law.
"Free Hong Kong was one of the world's most stable, prosperous and dynamic cities. Now, it'll be just another Communist-run city where its people will be subject to the party elites' whims. It's sad."
At a news briefing, he said the United States is deeply worried about the safety of everyone living in Hong Kong and warned that Washington would continue to implement President Trump's directive to cease the city's special status.
Jang Tae-hyun, Arirang News.