The death toll has risen to four in Taiwan's 6.3 magnitude earthquake.

The National Fire Agency said Monday that the third victim died after he was hit by a falling rock in the central county of Nantou, and the fourth was buried under a landslide in the same location.

The quake struck Sunday. The two victims whose deaths were reported earlier also were killed by falling rocks or rockslides. The NFA says 19 people sustained serious injuries in the quake.

Earthquakes frequently rattle Taiwan, but most are minor and cause little or no damage. Nantou is near the epicenter of a magnitude-7.6 earthquake that struck Taiwan in 1999 and killed more than 2,300 people.