IPOH: A Perodua Alza caught fire after it hit a gas cylinder which spilled from an overturned tanker at Km257 northbound of the North South Expressway after Menora Tunnel.
In the 9.22am incident, the tanker driver was believed to have lost control of his vehicle before it overturned and spilling the gas cylinders it was carrying.
Two cars - a Perodua Alza and a Proton Exora - which could not stop on time crashed into the cylinders.
However only the Alza caught fire after the gas cylinder it hit exploded.
Rescue operations are still underway.
The incident caused traffic on the stretch to come to a standstill.
Motorists are advised to exit at Ipoh and continue their journey at Federal route before exiting at Kuala Kangsar.