UPDATE 6/25/2014 5:20 PM
An update on Tuesday's Enviro-Tank explosion, injuring three men.
Officials say the explosion was caused by water and gas.
Kevin McClain was taken to Cabell-Huntington Hospital for severe burns.
Hospital officials say he's still in critical condition.
Fred Johnston and Justin Flesher were both treated and released Tuesday.
Calls have been made to Ohio EPA to see if they will be conducting an investigation.
UPDATE 6/24/2014 5:15 PM
We spoke with state fire marshal Larry Flowers.
He says Tuesday morning's explosion at Enviro-Tank Cleaning had nothing to do with the process of cleaning a tank.
It was something as simple as transferring gasoline.
"The truck that they were transferring fluids out of into a storage tank and what they feel very confident about is that during that process there was some vapors that were released and in that area there were several ignition sources and those vapors found its way to one of those ignition sources and then that created the explosion," says Flowers.
The fire marshal added that things things can happen with something as simple as static from a cell phone or light wind to push fumes into an ignition source.
Enviro-Tank's website says the company was started in 1991.
And they also have a facility in Wooster, Ohio.
The company provides non-hazardous waste disposal services, including oily wastewater and organic waste.
Also, the company provides waste transportation and tank trailer cleaning services.
Enviro-Tank is privately owned.
Its customers come from the private and public sectors in 10 different states.
UPDATE 6/24/2014 3:55 PM
The Washington County Sheriff's Office releases the names of the three men injured in the explosion at Enviro-Tank Tuesday morning.
Kevin S. McClain, 32, of Ravenswood WV is seriously burned and is in serious condition at the Cabell Huntington Burn Center.
He was transported to there from Camden Clark Medical Center.
McClain is a truck driver for West Virginia-based BBU Transport service.
Fred E. Johnston, 53, of Belpre, has burns to his face, hair, arms and chest.
Johnston was treated and released from Camden Clark Medical Center.
Justin A. Flesher, 33, of Belpre has burns to his left arm.
He was treated and released from Marietta Memorial Hospital.
UPDATE 6/24/2014 3:15 PM
Tim Brunicardi with Camden Clark Medical Center says one patient from Tuesday morning's explosion at Enviro-Tank was flown to Cabell Huntington Hospital.
Brunicardi says a second patient was treated at Camden Clark Medical Center and released.
The third patient was taken to Marietta Memorial Hospital with minor injuries.
UPDATE 6/24/2014 12:35 PM
Little Hocking Volunteer Fire Chief Mike Chevalier, who was first on scene of the Enviro-Tank Cleaning explosion, says heavy smoke and flames were showing when he arrived.
The Marietta Hazmat team was called in.
One injured person went to the hospital in a personal vehicle.
Chevalier says two others who were injured could be transferred to medical facilities outside the area.
Crews on scene coordinated with Washington County EMA to find out what materials were stored on site.
Responding firefighters were decontaminated as a precaution.
The state fire marshal is on scene investigating.
UPDATE 6/24/2014 11:50 AM
Authorities say two people were taken from the scene of the Enviro-Tank explosion to Camden Clark Medical Center, while one was taken to Marietta Memorial Hospital.
The three people were inside a building when a tank exploded.
The state fire marshal is on scene.
Officials with Enviro-Tank say they will not answer any questions until an investigation is complete.
We have reporters on scene and we'll bring you the latest information as it becomes available.
UPDATE 6/24/2014 10:50 AM
Authorities say the explosion at Enviro-Tank Cleaning happened when material was being transferred from inside a building to a truck.
Washington County Chief Deputy Mark Warden says the scene is under control.
He says three people were transported to the hospital with injuries ranging from minor to severe.
The Little Hocking, Belpre, Marietta and Dunham Fire Departments responded, as well as the Washington County Sheriff's Office.
The Hazmat team is on the scene for clean up.
The fire marshal is responding, as well.
We have a reporter on the scene and we'll bring you more information as it becomes available.
UPDATE 6/24/2014 10:30 AM
Washington County Sheriff Larry Mincks says the explosion at Enviro-Tank happened at 8:50 Tuesday morning.
He says numerous fire and EMS personnel are on scene.
Victims have been removed and are being treated.
The fire is currently under control.
Both lanes of State Route 7 northbound are open and one lane of southbound State Route 7 is open.
A representative of Enviro-Tank said there are no hazardous materials at the scene.
UPDATE 6/24/2014 10:10 AM
One southbound lane of State Route 7 remains closed.
Four people are injured as a result of an explosion at Enviro-Tank Cleaning.
A helicopter is taking at least one of the injured from the scene.
We'll bring you the latest as it becomes available.
Washington County Sheriff Larry Mincks says multiple fire departments are on the scene of an explosion at Enviro-Tank Cleaning on State Route 7.
Sheriff Mincks says there are injuries, but the extent of those injuries is unknown.
The cause of the explosion is unknown.
Southbound Route 7 is closed in that area.
We'll keep you updated.