India, Aug. 18 -- A man died at a hospital in West Bengal's North 24 Parganas district early on Monday morning, hours after he was critically injured in an explosion outside the Madhyamgram High School, police said. The area is located around 20 km to the north of Kolkata.

"The man was identified as Sachidananda Mishra, a resident of Uttar Pradesh. Before dying, he gave his father's phone number to the local police. When contacted, Mishra's family claimed that he was working at a factory in Haryana till two days ago and said they had no idea how he reached Bengal," a district police officer said, requesting anonymity.

"The man was apparently sitting on a roadside bench near the school late on Sunday night. He was carrying something in a...