New Delhi, May 2 -- Parents rushing to schools, children running out of classes, students crying, blaring sirens of fire-tenders, sniffer dogs being pressed into service -- these were the scenes witnessed outside schools in Delhi-NCR on Wednesday as more than 100 schools received a hoax e-mail about the presence of bombs on their premises.

It was only an hour or so since parents had dropped off their children at schools when they received messages from the school authorities, informing them that they have received an e-mail threatening the safety and security of the students.In panic, many parents rushed to the schools.

Noida resident Monika Arora, whose son studies in Class 12 in DPS-Noida, said, "My son had left for his extra classes at...