TEHRAN, March 26 (Reuters) - A 5.1 magnitude earthquake shook the southeastern Iranian city of Bam on Monday but there were no immediate reports of casualties, the official IRNA news agency said.

IRNA said the quake occurred at about 10 a.m. (0630 GMT). In 2003, Bam was hit by a major earthquake which killed 31,000 people.

Natural disaster experts say oil-producing Iran is one of the most earthquake-prone countries in the world because it is criss-crossed by several major faultlines.

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