Several police, fire and ambulance crews could be seen outside the New England Pentecostal Ministries, a simple white one-story structure in Pelham, a town about 30 miles (48 km) north of Boston.
Police say two people were shot during a wedding ceremony at a New Hampshirechurch before guests subdued the shooter until police arrived.
One of the people who helped subdue the suspect, who arrived and began shooting after the wedding began, suffered minor injuries, Roark said.
"Preliminary investigation of the matter indicates that this incident does not appear to be a random event", the statement said.
A photograph taken by a reporter for WMUR shows at least three emergency response vehicles at the church, as well as multiple police cruisers.
The church is located at 955 Bridge St. It is located between two larger cities, Nashua to the west and Salem to the east, and also borders MA to the south.
Lowell General Hospital in MA said in a statement that it received one patient from the shooting who has since been transferred to a hospital in Boston.
Garcia was found shot to death inside a Londonderry, New Hampshire, home on October 1.
Roark said the New Hampshire attorney general's office would provide more details later.
A memorial service for Luis Garcia was set to be held at the church at noon.
New Hampshire Governor Chris Sununu said that state officials are on scene assisting local first responders with the incident. Brandon Castiglione, 24, has been charged with second-degree murder in his death.
Garcia's obituary said he was a minister at the church.
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