Two firefighters were treated for heat exhaustion and a third suffered a minor leg injury after they responded to a stubborn blaze that tore through a paper recycling plant on Page Avenue on Thursday, authorities said.

A skeleton crew of two workers was inside the NYNJ Recycling plant at 800 Page Ave. when the fire started but escaped without injury, said Chief Paul Haggerty of the Lyndhurst Fire Department.  A firefighter is taken away from the fire in Lyndhurst on a stretcher Thursday, Nov. 26, 2015.

The fire was reported around 11:30 a.m. and quickly went to a third alarm. At one point, the flames jumped across Page Avenue and caused minor damage to a plastics company in the industrial area, but a sprinkler system kept the fire in check and firefighters managed to save that building, Haggerty said.

Part of the large, flat-roofed brick building that housed the recycling company collapsed during the fire. About 50 firefighters from Lyndhurst and surrounding communities battled the blaze, Haggerty said.  Smoke from the fire billowed out of the structure and spread through much of the township. A Bergen County hazmat team tested air samples but found no harm to the public, the fire chief said.

Haggerty said he was out on a coffee run for his family just before the fire was called in. Although he couldn’t join his family on time for Thanksgiving dinner, his wife, Corrine, brought the food to him and his crew at the scene. She handed him a heated container filled with turkey, stuffing, mashed potatoes and corn. “I packed extra forks for the guys, just in case they’re hungry,” she said.

The cause of the fire remained under investigation late Thursday afternoon.

The plant was formerly operated by Jem Sanitation Corp., a company that had ties to organized crime, according to a 2011 report by the state Commission of Investigation.