China issued a stern warning to Hong Kong protesters as well as the West on Sunday, reiterating that it will not tolerate any attempt to undermine Chinese sovereignty over the city.

"The end is coming for those attempting to disrupt Hong Kong and antagonize China," stated a commentary piece published by the state's Xinhua News Agency.

The strongly worded message was directed at "the rioters and their behind-the-scene supporters" -- which can be taken as an accusation of Western meddling. It said that "their attempt to 'kidnap Hong Kong' and press the central authorities is just a delusion," adding, "No concession should be expected concerning such principle issues."

The warning came as thousands of people blocked roads and public transport links to Hong Kong's airport.