The quake came early in the morning as schools were reopening in the Philippines after a long break, with the tremors felt strongly in a dozen provinces.

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…