A purported Telegram post circulated on social media, which claimed that the blast was carried out in retaliation to the "targeting" of pro-Khalistan separatists allegedly by Indian agents.
Locals said there was a "chemical-like" smell at the site and thick white smoke everywhere as panic gripped the Paschim Vihar area after the blast happened near a CRPF school.
The schools included Delhi Public School, Modern Convent School, and Shree Ram World School, a senior police officer said, adding that the threats were received via e-mail.
Delhi Police are investigating a series of bomb threats targeting schools and colleges, sent via encrypted networks. The threats have caused panic and disruption, prompting increased security measures and a police investigation into the source and motives behind the emails.
A low-intensity blast occurred near a multiplex in Delhi's Rohini on Thursday, injuring one person and sparking panic. The explosion took place near a park in the same area where a previous blast occurred in October. Delhi Chief Minister Atishi accused the BJP-led central government of failing to maintain law and order in the national capital.
Plumes of smoke could be seen billowing from the spot. A purported video of the aftermath of the explosion also surfaced on social media showing thick dense white smoke.
A private school in Delhi's Rohini received a bomb threat via email on Friday, but it was later declared a hoax after a thorough search of the premises. The threat came just a day after a low-intensity blast took place in Prashant Vihar, near the school. Police are investigating the incident.