The United Nations (UN) Office for the Coordination of Humanitarian Affairs (OCHA) is "closely monitoring the impact of the earthquake in Indonesia," which national authorities say has killed more than 90 people, the deputy UN spokesman, Farhan Haq, said here Wednesday.

"No official request for assistance has been made yet, but the United Nations stands ready to support Indonesia as required," Haq said at a daily news briefing here, China's Xinhua news agency reported.

At least 97 people have been killed and more than 600 others suffered from wounds after a powerful and shallow underland quake hit western Indonesia's Aceh Province earlier Wednesday, reports said.

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The 6.4 magnitude quake had left 613 people injured and more than 200 houses, shop buildings, school buildings, mosques and buildings damaged, Heni Nurmaini, press officer for emergency affairs at the provincial disaster agency, told Xinhua by phone.

The quake jolted at 5.03am Jakarta time Wednesday (22:03 GMT Tuesday) with epicentre at 18km northeast Pidie Jaya district and depth at 10km under land, an official of the meteorology and geophysics agency told Xinhua in Jakarta. - BERNAMA