JAKARTA, Indoneisa — A magnitude-6.7 earthquake rocked a large swath of Indonesia’s Sumatra Island on Tuesday, shaking buildings and causing panic, witnesses and meteorological officials said. There were no immediate reports of injuries or damage.

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The quake struck off the west coast of the island at 8:52 a.m. local time and was “strongly felt,” across west Sumatra and outlying islands, said Budi Waluyu, from the government’s geophysical and meteorological agency.

Callers to el-Shinta radio station from Medan, a large city on Sumatra, said tall buildings shook and some residents ran from their homes.

The U.S. Geological Survey said the quake had a magnitude of 6.7 and was centered 120 miles west of the Sumatra town of Sibolga, 860 miles northwest of Jakarta.

Earthquakes have struck the region regularly since a monster 9.1 magnitude earthquake on Dec. 26 that triggered a tsunami, killing more than 176,000 people in Indonesia and 10 other countries across the Indian Ocean.