A powerful magnitude 7 earthquake struck off Indonesia’s island of Sumatra on Friday, prompting authorities to issue a tsunami warning and to order people to evacuate their homes.

The quake hit about 227 km (141 miles) from the city of Teluk Betung on the island at a depth of 59 km (37 miles). 

The Indonesian geophysics agency quickly issued a tsunami warning and the country’s Disaster Mitigation Agency said that residents on the Banten coast of Java island should “immediately evacuate to higher ground”.

The US Geological Survey and the European-Mediterranean Seismological Centre both initially reported that the quake was greater than magnitude 7 before later revising their readings down to 6.8. However, the Meteorology, Climatology, and Geophysical Agency of Indonesia has maintained that it had a magnitude of 7.4.

There were no immediate reports of damage or casualties.

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