The Karachi police raided on Tuesday night one of the city's biggest public sector hospitals--Abbasi Shaheed Hospital.Three people were taken into custody and documents and hard drives were seized during the raid.Around 20 police personnel took part in the operation, arriving on motorcycles and in police vans. Their faces were all covered either by handkerchiefs or balaclavas. They blocked off the exit and entry points to the hospital during the search.The doctors’ apartments, trauma centre and IT department were all searched. Records, hard drives and other items were seized from the IT department building. The law enforcers broke the locks on the building in order to enter.City wardens stationed at the hospital say the police beat them up during the search operation. They want the Sindh IG to take notice.The Nazimabad police, whose jurisdiction the hospital falls in, have denied knowledge of any raid. They say the policemen who raided the hospital weren't from their police station.The raid occurred between 3am and 5am. Two of the people taken into custody have been identified -- one was the public relations officer and another was a clerk.