HONG KONG - Earlier this month, Hong Kong's protesters brought the city's airport to a standstill. The city's subway operator MTR said it was suspending services between seven subway stations in the protest area, to "ensure the safety of passengers and our staff." Hong Kong's subway stations have been sites for multiple protests and confrontations this summer. Hong Kong's airport -- the eight busiest in the world -- currently has an injunction in place against those who interfere with the airport. On Friday, Hong Kong police said there were elements of the protest movement that were "not peaceful."

Protesters take part in a rally as they march on a street on Aug. 18, 2019, in Hong Kong. (CNN) - Hong Kong's subway operator says it will crack down on violence at its train stations. The company, which is Hong Kong's sole subway operator as well as a real estate owner, said it will stop train service and immediately close stations "if fights, vandalism or other acts of violence occur." Two top executives at Cathay Pacific, Hong Kong's flagship airline, resigned last week as the company became entangled in the city's political crisis. Hong Kong's faltering economy is already suffering from China's slowdown and the US-China trade war, but the protests threaten to make things worse.