The strongest earthquake to hit the Philippines this year was centered at sea and caused damage in a key coastal city, knocking down power and setting off 1-metre tsunami waves along nearby coasts, officials said.

A magnitude 7.8 earthquake has shaken part of the southern Philippines, and a tsunami was possible on some regional coasts.

A powerful 7.8-magnitude earthquake struck off the southern Philippines on Monday, killing at least four people, injuring more than 200 and triggering a tsunami. Buildings were…