Wellesley's school superintendent apologized yesterday for allowing middle school pupils to participate in a prayer service during a field trip to a Roxbury mosque last spring.

The apology to parents was made after a group that has been critical of Islamic Society of Boston Community Center — New England's largest mosque and Muslim cultural center — released a 10-minute video featuring footage of Wellesley pupils bowing their heads during a prayer service.

The group, Americans for Peace and Tolerance, received the footage from a mother of one of the pupils, its director, Dennis Hale, said yesterday. The woman, whom they would not identify, went on the May 27 trip as a chaperone for her son's sixth-grade class, he said.

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