Letter threatening bomb blast found at Gujarat's Ahmedabad airport

A letter threatening a bomb blast was found at the Sardar Vallabhbhai Patel International Airport of Gujarat's Ahmedabad, ANI reported. "The letter is written by an unknown person," Sharad Singhal, JCP Ahmedabad Crime Branch said. Earlier, two schools and a college in Delhi-NCR received bomb threats over email which turned out to be a hoax.