The Hong Kong International Airport has limited its express train services ahead of the latest series of planned protests targeting the airport.
In a statement, authorities said only people holding valid flight tickets will be allowed to enter the terminal, with boarding from certain stations suspended for the day.
Officials also warned against using fake boarding passes, air tickets or flight booking information to enter the airport's terminal buildings, saying that "such behaviour could amount to forgery or using a false instrument".
It comes after a night of violent street clashes between the riot police and protesters.
US strikes Iran in response to attack on cargo ship in Strait of Hormuz
Venezuela quake toll tops 900, search intensifies for hundreds trapped
Germany hit by record temperatures as heatwave moves east
Israel, Lebanon sign framework peace deal after US-mediated talks
Rescuers comb Venezuelan quake rubble, thousands reported missing
