"The police appear to be the target", he said, reports Express News.
Rescue 1122 teams shifted the injured policemen and civilians to nearby hospitals, where an emergency has been imposed.
Washington on Thursday offered a $5 million bounty for the Pakistani Taliban militant leader, Mulllah Fazlullah, a day after a suspected USA drone strike on a training camp in a remote part of Afghanistan killed his son and more than 20 other militants preparing to launch suicide attacks in Pakistan.
At least seven people were killed and over a dozen others injured in a blast on the outskirts of Lahore in Pakistan on Wednesday.
Four of them are in critical condition, he said, adding that he was not sure about the nature of the blast at this point. He also directed the CCPO to ensure that best medical treatment is provided to the personnel and officers injured.More news: Forecasters warn of rain, strong winds and potential snow
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According to available information, a terrorist tried to entered camp of Raiwind congregation but policemen stopped him and suicide bomber blew him up, killing seven policemen while injuring 12 persons.
It was such a powerful blast that its sound was heard several kilometers from the site.
Lahore and its surroundings have been targeted by multiple bomb and suicide attacks in recent years.
Pakistan Rangers quick response force has reached the spot and cordoned off the area along with the police.
A spokesman for Jamaat-ur-Ahrar, a faction of the Tehrik-i-Taliban had telephoned Reuters and claimed responsibility for the February 14 attack.
This is the first explosion targeting the provincial capital in 2018.