A massive fire at a Red Hook, Brooklyn, warehouse is finally out after burning for more than 24 hours. 

FDNY crews were still battling hotspots early Friday at the warehouse near the waterfront on Van Brunt Street after the fire started late Wednesday night.

Crews spent the overnight hours and part of of the morning spraying water on the roof of the building. Chopper 2 flew over the scene and saw ladders from fire trucks stretched in the air to help reach the top. 

The task now is to determine what caused the blaze at the warehouse, which was built in the 1870s. 

"We had extensive damage to this building. We had the roof collapse, and we also had the fourth floor collapse. So we will have structural engineers evaluate that," FDNY Chief of Operations Kevin Woods said.

Windows facing Van Brunt street were completely gutted and large pools of water sat on the ground Friday. 

Fire's cause still unknown

The FDNY said more than 250 firefighters and EMS personnel responded to the five alarm fire. Two firefighters suffered minor injuries. 

According to the property manager, the fire started on the third floor, where carpenters have shops set up. The fire grew so large that FDNY boats near the docks at Red Hook sprayed water to help contain the flames and smoke. 

Nobody was inside the building at the time of the fire. 

"You can lose anything in a second"

"I guess it's surprising. I'm sure the fire department responded as quickly as they could, and it was still something that just went on and on," a woman named Adele, who works nearby, said. 

Dozens of artists keep work in the building. Now they're worried it may have been destroyed. The fire happened just weeks before the annual Red Hook Open Studios art show. Dozens of artists and small business owners are now left in limbo. 

"The building is filled with artists and artisans. I have a good friend who has a woodshop there, some really great artists in the building. Furniture makers, there's a motorcycle shop. Mostly small businesses," said Tomas Anthony, who lives across the street.

"You can lose anything in a second. So I was ready to say goodbye to it, and I still am," sculptor Jennifer Sirey said. 

"There's tons of water, so you never know where the water will go," painter Zach Bruder said. "I have things from maybe the past 10 years. It's possible they might not make it." 

Other artists said they rushed over to try to save whatever they could.