JAKARTA ~ A powerful earthquake measuring 6.3 struck off Indonesia’s Sumatra island early on Monday, officials said.

The quake struck at sea at 9:37am some 34 kilometers below ground, the Meteorology and Geophysics Agency said.

There were no reports of damage or injuries and there was no tsunami alert.

The quake’s epicenter was nearly 160 kilometers southwest of the town of Painan in West Sumatra province.

Sumatra’s western coast has been repeatedly jolted by strong earthquakes since last month.

On February 20, a 7.5-magnitude quake rocked Aceh province, at the tip of Sumatra, killing three people and seriously injuring 25 others on the remote island of Simeulue.