JAKARTA, Indonesia (AP) — The Latest on a magnitude-6.4 earthquake in Indonesia's Aceh province (all times local):

10:40 a.m.

A strong undersea earthquake that rocked Indonesia's Aceh province early Wednesday has killed at least 20 people and collapsed buildings.

Indonesia's TVOne station, citing the acting governor of Aceh, Soedarmo, says 20 people have died.

A frantic rescue effort is underway for survivors in districts nearest the epicenter.

The U.S. Geological Survey says the shallow 6.4-magnitude earthquake that struck at 5:03 a.m. Wednesday was centered about 10 kilometers (6 miles) north off Reuleut, a town in northern Aceh, at a depth of 17 kilometers (11 miles).

There was no risk of a tsunami, according to Indonesian authorities.