New Delhi: A massive blast occurred near the CRPF school in Delhi's Rohini at around 7:30 am on Sunday. There was no loss of life but the school wall, nearby shops and a car were badly damaged. After this, a security alert was issued in the capital. Initial investigation has revealed that the blast was caused by a crude bomb. The NIA is investigating the case. According to Delhi Police, CCTV footage of the incident shows smoke coming out after the blast. Suspicious 'white powder' has been found from the spot, which has been sent for investigation.