At least 17 children have been burned to death after a gas cylinder exploded on their school bus in eastern Pakistan, police have said, BBC reported.
At least seven more children were taken to hospital after the blast, which caused the bus to catch fire. The incident took place on the outskirts of the city of Gujrat.
Local media quoted the police as saying the driver had survived the explosion.
Gujrat is about 200km (120 miles) south-east of the capital Islamabad.
Compressed natural gas is used in millions of vehicles in Pakistan as a cheaper alternative to diesel and petrol.
Numerous previous vehicle explosions have been blamed on substandard cylinders used to contain the fuel.