LYNBROOK, N.Y.?A gunman opened fire at a church Tuesday, killing two people, one of them a priest who had just finished delivering the homily, authorities and witnesses said.

Rev. Lawrence Penzes was shot during a 9 a.m. Mass at Our Lady of Peace Church, said Karen Montalbano, a spokeswoman for the Diocese of Rockville Center, on Long Island. She said both Penzes, 50, and another victim were killed. The second victim’s identity was not released.

The shooter’s location was not immediately clear, but a neighbor said police appeared to be focusing on one home in the area.

About 30 to 40 people normally attend the service at the Roman Catholic church, according to a church worker who would not give her name. The woman said Penzes had just finished delivering the homily when he was shot.

The Rockville Center diocese, which encompasses Nassau and Suffolk counties, is home to 1.5 million Catholics.