Seventeen Pakistani children burnt to death on Saturday when a gas cylinder on the bus taking them to school exploded, media said.
Ten children were injured in the blaze on the outskirts of Gujrat, 100 miles (170 km) southeast of Islamabad, DawnNews said.
Many vehicles in energy-starved Pakistan are powered by relatively cheap compressed natural gas and cylinder blasts are common.
More top news
The final of the 'Big 6' energy firms to cut prices - EDF - has announced it is reducing gas tariffs by just 1.3%.
Memorial and Learning Centre to use digital technology to commemorate and educate about the Holocaust
ITV News returns to Bergen-Belsen with Bernard Levy, a Jewish British army officer who was only 19 years old when he liberated the camp.