Drone footage showing the aftermath of anexplosion in Californiathat injured six people and damaged several homes is circulating online.
The drone, which flies over the explosion site, captures a building surrounded by debris, vehicles with cracked windshields and smoke everywhere.
Other footage, captured on a home surveillance system the morning of Thursday, Dec. 11, was later shared on theAlameda County Fire Department's Facebook page. In the surveillance video, debris can be seen shooting into the air and falling onto the nearby street.
The department also shared footage from first responders. As they approach, a cloud of smoke surrounds the area as firefighters use hoses to fight off the flames.
Pacific Gas and Electric Company (PG&E) previously told USA TODAY that it was notified around 7:35 a.m. about a construction crew thatstruck an underground gas linewhile digging at a property. The construction crew is not affiliated with PG&E, the company said.
According to the company, utility crews were dispatched and found gas leaking at two separate locations. While crews stopped the flow of gas at around 9:25 a.m., the explosion happened about 10 minutes later.
Fire officials said three buildings were destroyed by the blast, and other buildings near the site were damaged. The department added that six people were taken to local hospitals, and all residents were accounted for.
The National Transportation Safety Board (NTSB) said onDec. 11 that it is investigatingthe explosion. PG&E also said it is investigating.
The NTSB told USA TODAY on Dec. 12 that investigators will begin documenting the accident scene and conducting a visual examination of the pipeline and equipment involved.
USA TODAY also contacted the fire department on Dec. 12, but has not received a response.
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Footage shows home appliances surrounded by debris
Altogether, 75 firefighters responded to the scene. The explosion and fire were escalated to a three-alarm fire. According to Fire Alarm Houston,a three-alarm fire"could involve a larger building, multiple floors, or a hazardous materials situation" and usually involves more firefighters.
The fire department shared a series of bodycam and surveillance clips captured on the day of the explosion.
At one point, a firefighter walks closer to the site, and crew members can be seen spraying water on the flames. Orange flames can be seen blazing in the background as crews attempt to put them out.
Another clip captured that day shows a stove with part of the roof caved in on top of it. The video also shows firefighters and a dog walking on the ground covered in scorched debris from the building.
Fire officials said the Red Cross is helping families displaced by the fire, and the cause of the explosion and blaze is under investigation.
What's next in the NTSB's investigation?
According to the NTSB, agency investigators will collect further information, such as:
Human performance data relevant to the accident and response.
Witness statements.
Pipeline operating practices and procedures.
Pipeline system maps and historical records.
Relevant pipeline pressures before and during the accident.
Pipeline maintenance records, integrity management plans/records, and safety management system plan/records.
Local environmental conditions, including soil conditions for buried pipelines.
The extent and path of released gas.
Any available surveillance video, including from doorbell cameras.
The agency said witnesses can send surveillance video or other relevant information to witness@ntsb.gov.
This story has been updated with new information.
Contributing: Thao Nguyen, USA TODAY
Saleen Martin is a reporter on USA TODAY's NOW team. She is from Norfolk, Virginia–the 757. Email her at sdmartin@usatoday.com.
This article originally appeared on USA TODAY:Drone footage captures aftermath of California gas explosion
