Hong Kong CNN  — 

Scenes of chaos erupted at Hong Kong’s airport on Tuesday evening as riot police clashed with protesters who continued to block security gates at one of the world’s largest travel hubs.

Tuesday saw some of the most combative scenes since Hong Kong’s protest movement began several months ago, with protesters detaining people at the airport, including a mainland Chinese journalist.

The city’s chief executive warned that Hong Kong was “on the brink of no return.” Five people were arrested and two police officers were injured, Hong Kong police said in a statement.