(UPDATE) Stranded passengers ran for cover as policemen arrived at the Hong Kong International Airport Tuesday night.
Among those stranded at the airport following the cancellation of hundreds of flights were Filipinos who were seen running towards a safe area in the check-in counter as the Hong Kong police arrive in the area.
One Filipino passenger was seen crying as she called her family online.
Protesters at the airport later clashed with police. Flights at the airport were disrupted for a second day, plunging the former British colony deeper into turmoil.
Several police vehicles were blocked by protesters, and riot police moved in, pushing some protesters back and using pepper spray at times.
Hong Kong's Airport Authority said operations at the airport had been "seriously disrupted".
Thousands of protesters, who swarmed the airport on Monday, started chanting and shouting as the police arrived.
An extended sit-in taking place inside the airport's lobby forced the airport authority to suspend check-in procedures and prompted cancellations of nearly all flights from late Monday afternoon.
Some largely young protesters staged a sit-in at the airport overnight.
With calls made on social media for a rally to continue at the airport on Tuesday, more than 2,000 people staged a sit-in in the afternoon blocking departure entrances, though a limited number of passengers were still allowed to get through.
Airport disruptions followed a three-day, peaceful sit-in at the airport's arrivals hall from Friday to protest against the controversial bill which would allow the transfer of fugitives to jurisdictions with which Hong Kong has no extradition arrangements, including mainland China. - with reports from Kyodo News and Reuters