Hong Kong police fire tear gas at protesters on harbourfront

Police fired tear gas and rubber bullets on Sunday at pro-democracy protesters who defied authorities to hold a rally on Hong Kong's scenic harbourfront, the latest flashpoint in months of political unrest gripping the city.

Clouds of acrid smoke wafted across streets usually packed with tourists, including outside the landmark colonial-era Peninsula Hotel, as protesters and police clashed in what has become a weekly ritual. 

Many of the protesters wore masks, defying a recent emergency law banning face coverings. But few of those involved in the early clashes had protective helmets and respirators used by more hardcore frontliners.

Tensions built early on Sunday afternoon as riot police flooded the harbourside park where the unsanctioned rally was due to take place.

Officers stopped and searched numerous people, sparking confrontations as the crowds got bigger, many of them shouting "black cops" and "triads" at the police.

Tear gas, pepper spray and some rubber bullets were fired in at least three different locations as clashes broke out and crowds scattered.

Small groups of hardcore protesters then built barricades and blocked roads in a familiar game of cat and mouse with...