Disruptions to flights in and out of Hong Kong worsened on Monday after protesters coordinated strikes to bring the city to a standstill.

After dozens of morning cancellations, airport authorities said they would reschedule flights starting from 12 p.m. local time and reduce the volume of arrivals and departures. Pilot and flight-crew unions for Hong Kong’s flag carrier, Cathay Pacific Airways, took part in the stop-work action.

Demonstrators also targeted key transport links and the airport’s high-speed rail service was suspended because of obstructions on trains and platforms.