Official state news agency Xinhua warns "violent radicals" are pushing Hong Kong into an "abyss" and says there should be no compromise to their demands.
"In light of the continuing unrest and the increase in violent incidents in Hong Kong, it is crucial that all sides exercise restraint, reject all kinds of violence and take urgent steps to de-escalate the situation", an European Union spokesperson said in a statement. "The Police will take relentless enforcement action to bring the persons involved to justice", the statement said.
"The United States, and all the freedom-loving nations around the world, must stand ready to swiftly move to defend freedom if China escalates the conflict in Hong Kong", Sen.
The Royal Thai Air Force (RTAF) plans to dispatch two aircraft and officials to help evacuate Thais from Hong Kong as confrontations between police and protesters raise the prospect that flights at Hong Kong's worldwide airport may remain suspended going into the weekend.
The political stand-off in Hong Kong that began with mass protests in early June has now become a significant contributing factor to global financial and economic instability.
"Using the sword of the law to stop violence and restore order is overwhelmingly the most important and urgent task for Hong Kong!" it said.
Demonstrators form a barricade as they clash with riot police at Hong Kong International Airport, Aug. 13, 2019.
Iran says US-led maritime coalition to bring insecurity to Gulf
The warning was delivered in a statement that also cited an advisory from the Transportation Department's Maritime Administration. P&O Cruises has cancelled cruises around Dubai and the Arabian Gulf after Iran seized a British-flagged tanker in the region.
The Chinese city of Shenzen is located across the border from Hong Kong. The airline, whose British heritage makes it a symbol of Hong Kong's colonial past, is also in a political bind. In a social media post in Chinese on Tuesday, the Global Times stated that "if Hong Kong rioters can not read the signal of having armed police gathering in Shenzhen, then they are asking for self-destruction", according to a CNBC translation.
Support is mounting for protesters in Hong Kong hours after President Donald Trump said that U.S.intelligence has informed him of Chinese troops being mobilized to a city bordering Hong Kong. "Everyone should be calm and safe!" he commented.
Trump's tweet came amid increasing tensions in Hong Kong between the government and protesters.
Videos promoted by state media showed Chinese military and armoured vehicles appearing to gather in the southern city of Shenzhen, which borders Hong Kong.
In remarks to the media earlier in the day, Trump virtually sympathised with Chinese and Hong Kong authorities, saying: "The Hong Kong thing is a very tough situation-very tough". I hope it works out peacefully. The actions of the protesters "seriously damage the global image of Hong Kong, and seriously hurt the feelings of a vast number of mainland China compatriots", said Xu, saying the "extremely abominable violent crime must be severely punished according to the law".
"I understand the basics of the protest and they've got a point: it's about freedom and democracy and it's incredibly important". "But we fight for our rights; democracy was promised as part of One country Two systems".