A Lutheran pastor in Newtown, Conn., has apologized after being reprimanded for participating in an interfaith vigil following the shooting massacre at Sandy Hook Elementary School.

The Rev. Rob Morris, pastor of Christ the King Lutheran Church, prayed at the vigil the Sunday following the Dec. 14 shootings alongside other Christian, Muslim, Jewish and Baha’i clergy.

Morris’ church is a member of the Lutheran Church-Missouri Synod, and the denomination’s constitution prohibits ministers from participating in services with members of different faiths.

It’s not the first time a Missouri Synod pastor has been reprimanded for joining an interfaith prayer service; a New York pastor also was suspended for participating in an interfaith service after the 9/11 terrorist attacks.

LCMS president Matthew Harrison wrote in a letter to the Synod that ‘the presence of prayers and religious readings