Police confirmed the nature of the blast and declared it a suicide attack asserting that a terrorist approached the check post using a motorcycle.
"The police appear to be the target", Deputy Inspector General Haider Ashraf told local media. The injured were shifted to Jinnah Hospital and Tehsil Headquarters Hospital (THQ) in Raiwind.
Two sub-inspectors and three constables are among the dead while the injured include ASP and SHO Raiwind.
The senior police official stressed that if the suicide attacker had managed to enter the congregation site, the death toll could have been much higher.
Initial reports suggested, a motorbike was used in the blast, he said, adding that it could have been the act of a suicide bomber.
More than a dozen other people were wounded in the explosion, which took place close to a police post set up near the grounds where a religious congregation was taking place.More news: US 'prepared to act' on Syria if Security Council does not
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The Taliban group Tehrik-e-Taliban Pakistan claimed responsibility, saying it was a suicide attack.
Meanwhile, IG Punjab Captain (retd) Arif Nawaz Khan has directed to declare a security high alert in the province. A search operation in the surrounding area has also been launched.
This is the first incident of such nature in Lahore this year, however, nearly 60 people lost their lives in terrorist attacks in 2017.
"Seven persons have been killed in the blast".
In July past year, 26 people, including nine policemen, were martyred and 58 others were injured in a suicide hit on Ferozepur Road. Three months earlier, a suicide bombing targeted a Pakistani government census team, killing at least six people in the eastern city of Lahore.