An investigation is underway to determine what sparked a church fire that injured several people in the Bronx early Sunday morning.

Investigators say the four-alarm fire broke out at around 1:30 a.m. at Love Gospel Assembly on Grand Concourse in Fordham.

The fire was brought under control about two hours later.

Fire officials say the two-story church was unoccupied at the time, although three civilians were injured.

A hotel next door, which was used by the city as a shelter for the homeless, was also badly damaged.

Parishioners who spoke with NY1 at the scene say the church runs a soup kitchen that has fed some four million people over the past four decades. They say they're heartbroken over the loss but are vowing to rebuild.

"It's going to be devastating for so many. Because the lines are so long to eat lunch. People depend on this, maybe this is the only meal they get a day, said one parishioner.

"This church always has its doors open for the whole population of this area here. For the people itself," said another.

"We will continue to continue to do the things of God. Our church, we feed 10,000 people a month. That's over 250 people a day and we don't want them in the community to think, their hope to die in the flames because ours hasn't," said a third.

It is unclear whether the civilians who were injured in the fire were homeless or from a nearby building.

Two of the victims were transported to St. Barnabas Hospital where one is listed in serious condition.

Another victim was hospitalized with minor injuries and a third refused medical attention.

Five firefighters suffered minor injuries battling the flames.