Delhi police and security authorities were yet again on high alert on Tuesday as bomb threat emails targeted multiple locations, including around 50 private and government and hospitals such as AIIMS, Safdarjung, Apollo, Moolchand, Max and Sir Ganga Ram hospitals and upscale malls like Chanakya Mall, Select CityWalk, Ambience Mall, DLF, and Cinepolis.

A police officer said the pattern of these threat emails matches with those sent earlier to hospitals, schools, universities and other government buildings, where the sender did not mention the dateline in the email.

Tuesday's mail threat warned that explosives would go off in a few hours, prompting authorities to launch searches on their premises, police officials said.

A call was received at 1.04 pm from a hospital in Nangloi and another from Primus Hospital at 1.07 pm in central Delhi's Chanakya Puri informing that they had received bomb threats, a Delhi Fire Services (DFS) official said.A thorough checking is being conducted by teams of the police, the dog squad, and bomb disposal squad while fire tenders were rushed to the spots.

The mailing list mentioned around 50 government and private hospitals, including AIIMS, Safdarjung, Apollo, Moolchand, Max, Primus, AAkash Healthcare, Venkateshwar,  and Sir Ganga Ram hospitals, police said.

"We have placed many explosives inside your building. They are placed in black backpacks. The bombs are set to go off in a few hours," the email, sent through Gmail at 12.04 pm, stated.

"You will end up in a pool of blood, none of you deserve to keep living. Everyone inside the building will lose their lives. I incessantly have nothing other than scam for humanity. Today will be your last day on earth," it said.