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All Saints, 120 Bellevue Ave., Haverhill: Memorial Mass at 7 p.m. for the victims, first responders and all affected by the explosions at the Boston Marathon.
St. Robert Bellarmine, 198 Haggetts Pond Road, Andover: Prayers will be offered at the 4 p.m. Mass for people directly or indirectly affected by the bombings and may be suffering trauma. There will also be prayers of thanksgiving for the first responders and volunteers and all the medical personnel who helped people.
Merrimack College, 315 Turnpike St., North Andover: Prayers will be recited for all the victims of the Boston bombings at the 5 p.m. Mass at Collegiate Church of Christ the Teacher.