Pakistani police said on Saturday that three police officers were killed by three gunmen in the Pakistani city of Faisalabad on Friday.
While the attackers were escaping the scene they dropped copies of a leaflet addressed to police officials which mention a Middle East-based terrorist group claiming responsibility for "recent attacks on security forces," a senior police official announced.
The leaflets reportedly warned police to quit their jobs or face violence.
The police stated they were investigating several pieces of evidence related to the attack.
"The role of DAESH cannot be ruled out, though they don't have any known presence in Faisalabad," police chief Afzaal Kausar told Reuters.
He indicated similar assaults had occurred in Lahore and Islamabad in the past week and security forces suspected the same group could be behind the deadly attacks.
This month the Pakistani government stated that there was "no organised presence" of the DAESH terror organisation in Pakistan, after an intelligence chief warned a parliamentary panel that DAESH was a threat and was organising in the country.