A magnitude 7.8 earthquake shook part of the southern Philippines early Monday, causing damage in a key coastal city, knocking down power and sparking a tsunami warning on some regional coasts.

People were urged to go to higher ground. There were no immediate reports of casualties.

The Pacific Tsunami Warning Center said tsunami waves up to 10 feet were possible on some coasts of the Philippines. Waves up to 3 feet were possible on some coasts of Indonesia and Malaysia.