Hong Kong Protests: Siege of Polytechnic University

Hong Kong police have launched an operation to drive hundreds of anti government protestors off a university campus – after a day of violent clashes.

A policeman was injured after he was shot in the leg with an arrow – while a huge fire broke out on a footbridge after protestors set debris ablaze.

Police have now issued an ultimatum for people to leave the area – with a barrage of tear gas and water cannon fire.

From Hong Kong, Matt Frei reports.