Authorities responded to the New England Pentecostal Church in Pelham, a town of about 13,000 on the border of MA, around 10 a.m.
The police chief also noted that more than one person was shot but did not give any other details beyond that.
Lowell General Hospital in MA received one patient from the church shooting, who was then transferred to a Boston hospital shortly after noon Saturday, according to Angela Struck, director of public relations for the hospital. Stay tuned for further information on this situation.
Halloway taken into custody after some of the approximately 40 guests at the wedding "gang tackled" him and held him down until police arrived, Roark said.
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Local police have turned the criminal investigation for Saturday's shooting over to investigators with the New Hampshire Attorney General's Office and New Hampshire Police Major Crime Unit.
A suspect has been arrested in the shooting at the New England Pentecostal Church, Roark said.
The Pelham Police Department provided active shooter training to members of the church within the past year, Roark said.
The suspect was taken into custody and the gunshot victims were brought to area hospitals by ambulance. Funeral services for an ordained minister from the church, shot to death earlier this month, had been scheduled in the afternoon, according to the New Hampshire Union Leader.
Ordained minister Luis Garcia was found dead inside his home in Londonderry on October 1. A man has been charged in his murder and is jailed.