Hong Kong police have admitted deploying officers disguised as anti-government protesters during mass unrest that rocked the city on Sunday.
Some officers disguised themselves as "different characters", a spokesman said, adding that the "decoy operation" had targeted "extreme violent rioters".
It comes after video surfaced showing suspected undercover officers making arrests during Sunday's clashes.
Protesters have called for an inquiry into the actions of the police.
Hong Kong's mass demonstrations and unrest show no sign of abating, more than two months after they were sparked by a controversial extradition bill that has since been suspended.
On Monday, protesters occupied Hong Kong's international airport forcing the cancellation of flights, but the authorities say flights are now resuming.
On Monday, in a news conference that was at times heated, Deputy Police Commissioner Tang Ping-Keung defended the use of the "decoy officers".
"I can say that during the time when our police officers were disguised... they [did not] provoke anything." he said. "We won't ask them to stir up trouble."
"Our operation... is targeting extreme violent rioters," he added. Mr Tang said police were responding to protesters who had used slings and hurled petrol bombs.
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