Indonesia ? A 7.7 earthquake shook Indonesia’s northwest island of Sumatra early today, prompting a brief tsunami warning and sending residents rushing for higher ground. There were scattered reports of injuries, but only minor damage was reported in most areas.

The quake struck at 5:15 a.m. local time and was centered 125 miles northwest of the coastal town of Sibolga in Sumatra at a depth of 19 miles, the U.S. Geological Survey said. It had earlier said the quake measured 7.8.

Indonesia’s Meteorology and Geophysics Agency and the Pacific Tsunami Warning Center in Honolulu issued tsunami warnings following the quake, but lifted them two hours later.

A hospital on Simeulue island off the coast of Sumatra admitted 17 people for treatment of injuries sustained in the quake, including four in critical condition, said Capt. Ajas Siagian, a deputy police chief for the area.