Superintendent of Police Sukesh Jain said identification of the accused was being done with the help of the CCTV footage.
Around 6.30 am, five to six men who drove up in motorcycles barged in to the facility and threatened the staff. A few of them rushed to the Intensive Care Unit (ICU) where they pointed a gun at the doctor on duty and demanded immediate care for their friend who they claimed had got injured in an accident.
When they were asked to fill the intake form, they refused to sign the papers and beat up the receptionist.
The police are probing the matter. They suspect the gang had committed some petty crime or got into a fight with another gang that left one of them injured. Efforts are on to track down the men, police said.