Officials said analysis of CCTV footage from three days leading up to the blast yielded no clue, but they will continue to scan footage of the past 10-12 days.

Early Sunday morning, a loud explosion startled Rohini Sector 14 residents, causing significant damage to shops and buildings. The blast led to thick smoke and shattered windowpanes but fortunately occurred when the area was relatively empty,

Police said the wall of the school, nearby shops and a car received damage and the area has been cordoned off.

A powerful explosion went off outside CRPF Public School in Rohini, Delhi, Sunday morning, damaging property but injuring no one. Authorities, includi