SAN`A, Yemen (AP) _ Three nuns who worked with the Calcutta-based Missionaries of Charity were shot to death on Monday as they were leaving a clinic in the Red Sea city of Hodeida, a Yemeni official said.

The official said one of the nuns was from the Philippines and two were Indian.

They were killed by gunmen carrying automatic rifles, he said. He spoke on customary condition of anonymity.