Sanjay alias Dhillu, aged around 40 years, belonged to Bahadurgarh in Haryana. He was convicted in a murder case and lodged in the Mandoli jail. He was also undergoing trial in some other cases, a senior Delhi Police officer said.
The convict had gone to the Maulana Azad Institute of Dental Sciences for treatment on February 9 and was advised to visit again on Monday.
Around 11:20 AM, when he was being escorted by the police personnel back to the jail, a group of unidentified bikers reached the spot and threw chilli powder in the eyes of assistant sub-inspectors Braj Mohan and Naresh Pal and Head Constable Yogender, a senior officer of the Delhi Armed Police TKS Singh told news agency PTI.
Mr Singh, who is the DCP of the 3rd Battalion of the Delhi Armed Police said that the three policemen belonged to his battalion, adding that all of them were suspended.
The policemen had accompanied the prisoner in a van provided by the jail authorities. The number of men who helped the prisoner flee is not yet known.
As Sanjay was fleeing on one of the motorcycles of his associates, the policemen fired four rounds to stop him but he managed to escape, the officer said. Sources claimed that one round was also fired by the men helping Sanjay.
A case was registered and efforts were on to capture Sanjay and his associates, the police said.