The death toll from a powerful 7.7 magnitude earthquake in Myanmar has jumped to nearly 700 according to the government, state-run media.

The powerful earthquake, which had its epicenter in central Myanmar about 13 miles from Mandalay, Myanmar’s second-largest city, struck around 12:50 p.m. local time, the New York Times reported. It was followed by several tremors, including a 6.4 magnitude aftershock which occurred just 11 minutes later.

A U.S. government analysis based on the strength and depth of the earthquake estimated there could be thousands of deaths and severe economic loss.