Metropolitan Magistrate Sunil Gupta also had a close shave as one of the bullets scraped past his chair and hit the wall behind, said police.
The deceased constable, identified as Ram Kumar, posted at Delhi Police's third battalion, which is entrusted with the transport of undertrials between courts and prisons, was hit by four bullets.
The Delhi government has announced a compensation of Rs 1 crore for the family of the deceased policeman.
Both Irfan and the constable sustained two bullet injuries each and were admitted to a hospital, where Kumar was declared brought dead, said the official.
The assailants, of which some are suspected to be minors, fired around ten rounds.
The four youths detained so far belong to northeast Delhi's Seelampur and nearby areas.
From their questioning it has emerged that Irfan, who has numerous cases registered against him at different districts of the national capital, had allegedly killed a member of the attackers' gang in south Delhi.
"A case of murder has been registered and several teams are working on it. Four persons have been detained at the police post inside the court premises and they are being questioned," said DCP (East) B S Gurjar.
The police are also investigating as to how the assailants managed to get inside the court with arms dodging layers of security, said an official.
The assailants were waiting for the undertrial to arrive before they opened fire. They tried to escape but the lawyers and security personnel inside the court held them and handed them over to the police team which was rushed there following a PCR call, police said.
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