At least 157 people burned to death after an oil tanker overturned, spilling its payload onto a highway in the Pakistani city of Bahawalpur, according to authorities.

Various estimates place the number of people injured between 130 and 200.

The injured have been taken to two local hospitals, Rescue 1122 Director General Dr. Rizwan Naseer told Geo TV Pakistan.

Army helicopters were deployed to take the injured to hospital, according to Major General Asif Ghafoor, the official spokesperson of Pakistan's armed forces.

Army Aviation helicopters sent for evacuation of casualties to hospitals / burn centres. Hospitals placed on high alert. (2 of 2). — Maj Gen Asif Ghafoor (@OfficialDGISPR) June 25, 2017

WARNING: EXTREMELY GRAPHIC VIDEO

After the tanker overturned in the Pul Paka area near the National Highway, people in the vicinity rushed to the vehicle to collect fuel.

Some were smoking, which reportedly led to the ignition of the gasoline and caused the furious inferno, according to reports.

BREAKING: Rescue official says over 100 dead on Pakistan highway after oil tanker turns over, ignites fire — The Associated Press (@AP) June 25, 2017

It has been reported that over 70 motorcycles and a number of cars were also been destroyed in the blaze.

COAS expresses grief on losses in oil tanker incident. Directed provision of full assistance to civil admn in rescue/relief effort (1 of 2). — Maj Gen Asif Ghafoor (@OfficialDGISPR) June 25, 2017

Local news outlets reported that the bodies have been burned beyond recognition. DNA tests will be required to identify the deceased.

بہاولپور آئل ٹینکر لیک ہوا

لوگ تیل اکھٹا کرنے آ گئے تو اچانک ٹینکر پھٹ گیا

123 افراد موقع پے جلس کر اللہ کو پیارے ہو گئے 😐😓 pic.twitter.com/IHXUFco3ov — Waqar (@WishMaster_0) June 25, 2017

Medical staff fear more deaths, as some victims suffered burns to 80 percent of their bodies.

#BREAKING At least 123 killed after oil tanker fire in Pakistan pic.twitter.com/GITab3UzmS — CGTN (@CGTNOfficial) June 25, 2017

Authorities are investigating the cause of the crash. Reports from the scene suggested the truck had been speeding, while Reuters reported it was trying to make a sharp turn when it flipped.