Police said that at least seven people has killed. More than 50 has injured after the explosion in a class at a religious school in Pakistan. According to a report by BBC.
An official at the scene told the BBC that there were children of all ages among the dead.
Dozens of people has injured in the attack in the northern city of Peshawar.
No group has claimed responsibility and investigation has launched.
Peshawar, close to the border with Afghanistan, has experienced the worst violence during the Taliban insurgency in recent years.
Six years ago, gunmen attacked a military school in the city, killing more than 150 people, including many children.
However, in recent years, the number of attacks has been greatly reduced.
The police told the BBC that the explosion occurred at 08:30 local time (03:30 GMT).
There are about 60 students in this religious school, which is madrassa.
Witnesses told the police that shortly before the explosion, a man entered the building with a bag of explosives.
The image inside the room showed severe damage.
Assistant police chief Shafqat Malik told Pakistan’s Express newspaper that 5 kilograms (11 pounds) of explosives were used in the attack.
Hospital officials told Reuters they had injured dozens of people, many of whom had been burned.
Agence France-Presse news agency quoted the police as saying that there were two teachers among the injured.
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"The blast took place in a madrassah during a Quran class. Someone took a bag inside the seminary," said Waqar Azim, a senior police official. At least seven people have been killed and more than 70 injured in an explosion this morning at a madrassah in Peshawar's Dir Colony. #DawnToday