INVESTIGATIONS are currently ongoing into a large-scale house fire, requiring a multi-agency response, which occurred near the Warren township earlier this week.

On Wednesday 8 June at 5.25am, crews from Fire and Rescue NSW Station 491 in Warren were called to reports of a house fire on Garden Avenue at Ravenswood, near Warren.

Two Fire and Rescue vehicles along with a number of RFS firefighters arrived on scene at around 5.35am, discovering the house already totally alight.

Fire and Rescue NSW Superintendent Adam Dewberry said crews got to work quickly, wearing breathing apparatus and using lines of 38mm hoses.

"There was then a concern that the building had been constructed using asbestos, so we also sent up a hazmat truck from Dubbo," Supt Dewberry said.

"So as a precaution, a bonding solution was used and firefighters also underwent a decontamination process."

The fire was extinguished at about 7.30am with the vacant home extensively damaged.

ABOVE: The fire took a little under two hours to extinguish. Image: Fire and Rescue NSW Station 491 Warren.

Members of the Warren Fire and Rescue brigade have since expressed their appreciation for the assistance given by their fellow responders, with the last of the fire crews finishing their duties about nine hours after the initial callout.

In addition to the fire and hazmat crews, there was also a presence from local NSW Police officers and NSW Ambulance paramedics.

Supt Dewberry said there was also a dog brought in which is specially trained in accelerant detection as part of the ongoing investigations into the cause of the blaze.

"This method is actually used quite a lot in situations like this. If the dog detects any accelerant, that lets the forensic investigators know to further investigate a certain area," he said.

The Fire and Rescue brigade has also said they encountered issues sourcing water to fight the blaze, saying it served as a reminder for residents to keep fire hydrants on or near a property clear of any flower beds or lawn.

ABOVE: Firefighters say residents should be making sure the area around fire hydrants is kept clear. You never know when it will be needed next. Image Fire and Rescue NSW Station 491 Warren.

"It's important to make sure you keep local hydrants clear, have a working smoke detector and if there is signs of a fire, get up, get out and call 000," Supt Dewberry said.

"Smoke in a fire is loaded with carbon monoxide and is extremely toxic. It's definitely the silent killer in situations like this."

At the time of writing, it has not been confirmed whether or not any accelerant was detected, however the fire is currently being treated as suspicious.

Officers from the Orana-Mid Western Police District have since commenced an investigation. Anyone who witnessed the incident or has information which might help investigators is asked to contact Warren Police or Crime Stoppers on 1800 333 000.