A strong 6.6-magnitude quake rocked Indonesia's Aceh province on Sumatra island Wednesday, the meteorology and geophysics office said.
The earthquake struck at 3:08 pm (0808 GMT) some 42 kilometres (25 miles) northwest of Sinabang in Aceh province, at a depth under the sea of 30 kilometres, the office said.
Indonesia sits on the Pacific "Ring of Fire" where continental plates meet, causing frequent seismic and volcanic activity.
The earthquake-triggered Asian tsunami in December 2004 killed some 168,000 people in Aceh, which is located at the northern tip of Sumatra. Indonesia was the nation worst hit by the tsunami. (AFP)
Strong quake rocks Indonesia's Aceh