One semi-automatic pistol with three live cartridges and three empty shells were recovered from the spot, police said.
Two assailants dressed as lawyers opened fire at gangster Jitender Gogi inside the courtroom where an attempt to murder case was being heard against him on September 24.
Police charge sheet names five for hatching a plot to eliminate jailed gangster Jitender Gogi; investigation is still on
The assailants, who were from the rival gang, opened fire at undertrial prisoner Gogi inside a courtroom where a murder case was being heard against him on September 24.
Kataria had planted the explosive in a tiffin box inside the courtroom as he wanted to kill his neighbour, who is an advocate, police said.
Police said they are checking the CCTV footage of the premises and questioning the people who were present inside the court complex at the time of the incident.
A man was injured in the explosion that took place on Thursday, creating panic among lawyers and the public and raising questions about security arrangements there.
A Delhi Police release said there was no casualty, but a Naib Court, head constable Rajeev, sustained minor injuries and was receiving treatment.
While the bar association raised the issue of security lapses, the police officials assured them of better security system in the future.
The bench said that there was a need for a fool-proof entry system, installation of metal detectors and proper training of police personnel.
A few days ago, the Crime Branch had taken another jailed gangster Tillu Tajpuriya in its custody to grilled him about the killing of gangster Jitender Gogi inside a Rohini courtroom last month.
A bench of Chief Justice D N Patel and Justice Jyoti Singh asked other stakeholders, including the Centre, Delhi government and various bar associations to also their give suggestions.
The bench said that there was a need for a fool-proof entry system in courts, installation of metal detectors, under vehicle surveillance system, etc.
Rohini court shootout: HC asks police to file status report on plea to enhance security in district courts
Justice Rekha Palli issued notice to Delhi Police and Bar Council of Delhi (BCD) on a petition filed by a woman advocate and said the report be filed within five days.
On September 24, a shootout inside the Rohini courtroom left three gangsters dead and a law intern injured.