JAKARTA, Feb 21 (Reuters) - An earthquake struck off the Moluccas islands in the eastern part of Indonesia on Wednesday, the country's meteorology agency said, although there was no immediate report of a tsunami warning or casualties.

Indonesia's Meteorology and Geophysics Agency put the quake at 6.0 on the Richter scale and said the epicentre was 34 km (21 miles) from Labuha town in North Moluku province.

The U.S. Geological Survey said on its Web site that the quake's magnitude was 5.5 and occurred at 11.19 am (0219 GMT) with the epicentre 10 km under the sea.

A stronger earthquake struck the area on Tuesday, triggering a brief tsunami alert.

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