The Delhi Police has registered an FIR regarding the explosion near a cinema hall in Rohini on Thursday, officials said.
The low-intensity blast that occurred nearly 40 days after an explosion took place at a CRPF school in the same area left one person injured and triggered panic among residents.
A case under sections 326(g) (mischief with severe consequences to public safety) of the Bharatiya Nyaya Sanhita, section 4 of the Prevention of Damage to Public Property Act and section 3 of the Explosive Substance Act was registered at the Prashant Vihar police station, an officer said.
The case was registered against unknown people and efforts are underway to arrest the accused who dumped or planted the explosive material at the site, the officer said.
Over a dozen teams of the Special Cell, the Crime Branch, and the local police have scanned the footage from the CCTV cameras of the area but nothing suspicious has been found yet, he said.