Ashraf said numerous wounded were police and three were hospitalized in critical condition.
The area deputy inspector general police, Haider Ashraf, told reporters a religious congregation of about 60,000 people was underway in the Raiwind area and the bomber on a motorbike meant to attack the worshipers.
Police said the blast took place after evening prayers and most members of the religious group had exited into the street, some making purchases nearby.
The suicide attacker for Mall Road blast was traced back to Afghanistan while an accomplice was nabbed. The injured were shifted to Jinnah Hospital and Tehsil Headquarters Hospital (THQ) in Raiwind.
According to media reports, the blast occurred near a police vehicle at a check post.
At least eight persons, including four policemen, lost their lives and 20 others have been injured in the suicide blast which targeted a police check post in Raiwind on the outskirts of Lahore, said Punjab Health Minister Salman Rafique. "The condition of some policemen is critical", he said. He also directed the CCPO to ensure that best medical treatment is provided to the personnel and officers injured.
It was such a powerful blast that its sound was heard several kilometers from the site.
This is the first incident of such nature in Lahore this year, however, nearly 60 people lost their lives in terrorist attacks in 2017.
Pakistan Rangers quick response force has reached the spot and cordoned off the area.
The Taliban group Tehrik-e-Taliban Pakistan claimed responsibility, saying it was a suicide attack.
In February a year ago, 18 people were killed, including several police officials, and more than 80 wounded in a suicide attack during a protest on a busy intersection of Lahore.