Four children, aged 7 to 10, and an adult were injured in an explosion in the northwestern Pakistani city of Peshawar early on Tuesday, hospital and rescue officials said.
Bilal Ahmad Faizi, the spokesman for emergency rescue services, said an improvised explosive device (IED) went off on a busy road in Peshawar at 9:10 am (0410 GMT). He said five people, including four children, were injured.
Two of the children were in critical condition, Mohammad Asim, a spokesman for the Lady Reading Hospital in Peshawar, said.
There was no immediate claim of responsibility for the attack.
Peshawar's police chief, Mohammad Ashfaq Anwar, told Reuters that there was no indication school children were the target of the attack.
Peshawar, which straddles the edge of Pakistan's tribal districts bordering Taliban-ruled Afghanistan, is frequently targeted by terror groups including the IS and Pakistani Taliban.


South Korean ferry runs aground, all 267 people rescued
Indonesia's Semeru volcano erupts, alert level raised to highest
19 killed and 66 wounded in heavy Russian attack on Ukraine
Elon Musk, Ronaldo attend Trump's dinner for Saudi Crown Prince
Louvre museum to add 100 external cameras by 2026 after heist