Hong Kong, Aug. 13 -- Protesters severely crippled operations at Hong Kong's international airport for a second day Tuesday, forcing authorities to cancel all remaining flights out of the city after demonstrators took over the terminals as part of their push for democratic reforms.

After a brief respite early Tuesday during which flights were able to take off and land, the airport authority announced check-in services for departing flights were suspended as of 4:30 p.m. Departing flights that had completed the process would continue to operate.

It said it did not expect arriving flights to be affected, though dozens were already canceled. The authority advised people not to come to the airport, one of the world's busiest transport hubs....