Security was tightened at Hyderabad's Rajiv Gandhi International Airport on Friday after an anonymous email warned of an impending explosion and claimed sleeper cells were active.

Police quickly launched a search across the airport premises, but no suspicious items were found. Authorities clarified that the threat didn't mention any specific bombs, calling it a general warning. "We're treating it seriously and taking all necessary precautions," a police official said. "So far, nothing alarming has been found." A formal case is being registered, and the investigation is ongoing to trace the origin of the email.