The harshest storm to reach the Western Pacific this year, Typhoon Usagi hit Hong Kong on Sunday, canceling more than 370 flights and shutting down one of the world's busiest sea ports.

A No. 8 signal warning, the third highest on a five-point scale, remained on Monday morning, forcing financial markets to stay closed for the first part of the day. Authorities said they might lower the warning signal before 10:00 am local time (01:00 GMT).

A total of 25 people were killed, national television broadcaster CCTV reported.