PESHAWAR: Seven people, including three school children, sustained injuries, two of them serious, in an explosion on Warsak Road on Tuesday morning.According to police, the explosive was planted alongside the road near a private bank and a school. Glasses of nearby buildings shattered by the explosion.Rescue teams and security personnel reached the spot within minutes and removed the injured to Lady Reading Hospital.The hospital sources said the condition of a nine-year-old child is serious. The injured children are between seven and 10 years of age, they added.The injured have been identified as Ahmed Zia, Ehsanullah, Javed Khan, Zahirullah, Saad Ahmed, Shakirullah and Yusuf Khan. The bank staff remained safe in the blast.Wardak SP Arshad Khan told media that the blast took place at 9: 10 am. Four kilogram explosives were used, he continued. An investigation into the incident has been launched and it is being ascertained when the explosive material was planted, he said.Peshawar, which straddles t he edge of Pakistan's tribal districts bordering Taliban-ruled Afghanistan, is frequently targeted by Islamist militant groups including Islamic State and the Pakistani Taliban.Interim Prime Minister Anwar-ul-Haq condemns Peshawar blast.