New Delhi, Dec. 4 -- Two Delhi University colleges - Ramjas College and Deshbandhu College - received emails early Wednesday warning of bombs planted on their campuses, triggering massive security checks, evacuations and panic among students before officials confirmed the threat was a hoax.

According to police, the emails were received around 1:59 AM with the subject line:

"3 RDX IEDs placed in Deshbandhu and Ramjas College to blast at 1:15 pm."

The email further claimed:

"With the collusion of Pak ISI cells who were provided safe haven in Coimbatore, this operation to blast two colleges in Delhi was planned for today. Please evacuate all students and staff by noon and be safe."

Following the alert, Delhi Police, Bomb Disposal Squad,...