A massive house fire in Chester drew a major multi-agency emergency response last evening, with the blaze ultimately reaching a fourth alarm and leaving multiple firefighters injured.

The fire broke out at 67 Rock Ridge Road, prompting firefighters from Chester, Warwick, Washingtonville, Goshen,  Kiryas Joel, Woodbury, Monroe, Florida, Greenwood Lake, South Blooming Grove, Salisbury Mills, New Hampton, Pine Island and other departments to respond.

Multiple EMS agencies, including Empress EMS, Monroe EMS, Warwick EMS and Kiryas Joel Hatzolah, responded, while Chaveirim of Orange County also assisted at the scene.

The fire was upgraded first to a third alarm and later to a fourth alarm as crews battled the large blaze. The main body of the fire was eventually extinguished, though crews continued working on smaller flames and brush fires in the surrounding area.

Multiple firefighters were injured while battling the blaze and were transported to nearby medical centers for treatment.

Chester Police and the Orange County Sheriff’s Office were also on scene, along with federal arson and explosives investigators as authorities began investigating the circumstances surrounding the fire.

The cause of the blaze remains under investigation.