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Hong Kong airport authority cancels all flights for Monday

HONG KONG, Aug 12 (Reuters) - Hong Kong's Airport Authority has cancelled all flights not yet checked in by Monday afternoon, the agency said, as anti-government protesters peacefully demonstrated at the airport for a fourth day.

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

Traffic on roads to the airport was very congested and car park spaces were full, the authority said.

The increasingly violent protests have plunged Chinese-ruled Hong Kong into its most serious crisis in decades and presented a serious challenge to Beijing. (Reporting by Felix Tam, Clare Jim, Twinnie Siu; writing by Farah Master; editing by Darren Schuettler)