Hong Kong airport on Monday cancelled all the remaining flights due to the ongoing protest in the terminal.

According to airport authorities, flights – departing and arriving – are being suspended at one of the world’s busiest travel hubs after thousands of protesters entered the arrivals halls to stage a demonstration.

“Other than the departure flights that have completed the check-in process and the arrival flights that are already heading to Hong Kong, all other flights have been cancelled for the rest of today,” the airport authority said in a statement.

“Airport operations at Hong Kong International Airport have been seriously disrupted as a result of the public assembly at the airport today,” the statement added.

It said traffic on roads to the airport was very congested and car park spaces were full. “Members of the public are advised not to come to the airport,” the statement added.

Local media reported that airport staff has been requested to leave the airport as soon as possible, including major airlines like Cathay and Hong Kong Airlines.

Increasingly restive protests for over two months have plunged Hong Kong into its most serious political crisis in decades and presented a serious challenge to Beijing.

The protests, which started over a controversial extradition bill, expanded into wider calls for democratic reforms and an independent inquiry into police conduct during the demonstrations.

The protest movement’s demands also include the resignation of the Chinese territory’s leader Carrie Lam and an election for her successor.

Over the weekend, as demonstrators threw up barricades across the city, police shot volleys of tear gas into crowded underground train stations for the first time, and fired bean-bag rounds at close range.

Scores of protesters were arrested, sometimes after being beaten with batons and bloodied by police. Police have arrested more than 600 people since the unrest began.