In a police raid on a gambling den in north Delhi on Thursday night, shots were fired and four police personnel beat up. The four policemen had to run for their lives as goons attacked them with lathis (batons) and rods.Acting on a tip-off, the police received information about brothers Bhola and Mange allegedly running a gambling den in Samayput Badli spurious liquor was also served at the den.What happened on Thursday nightThe police immediately rushed to the spot, the police team comprising assistant sub-inspector Vijendra and constables identified as Satyendra, Pradeep and Robin found people drinking and gambling. When constable Satyendra showed his police ID, the brothers started threatening the cops and an altercation followed. Now, this is when a group led by Bholas sister Simran attacked the police with batons.When Pradeep tried to capture the entire scene on his smartphone, the attackers snatched it. Then, Bhola allegedly opened fire on Satyendra, but he somehow managed to dodge the bullet. To bring the situation under control, constable Robin fired in the air. While Bhola fled the scene, the others kept thrashing the cops. At one point, one of the attackers tried to choke ASI Vijendra. The police team somehow escaped from the spot.Case filed against attackersThe injured cops were then taken to the hospital for further treatment. Meanwhile, a case was filed against the attackers under charges of attempted murder, obstructing government work, among others, have been invoked and police are now looking for about six accused.