The murder accused along with two other accused in different cases were being produced by the police before a court in Mahendergarh.
While two of the accused were being escorted by other policemen, the murder accused Vikram was also under police escort and was being taken inside the court complex, SP, Narnaul, Anil Dhawan said over phone.
He said Vikram tried to free himself by jumping from the boundary wall to escape, but was overpowered by the cops who tried to take him inside a police vehicle.
One cop was seriously injured in the incident.
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The armed assailants, who had come on motorcycles, managed to free Vikram and escape from the spot.
"We have registered a case and launched a manhunt to nab the accused," Dhawan said.
Earlier in May, in a brazen daylight shooting, two men in women's clothing had opened fire outside the district court complex in Rohtak, killing an associate of a gangster who was present there for a case hearing.