At least two people were killed, and four others sustained injuries in an explosion in Kankinara area of North 24 Parganas district on Monday night.
Locals say that unidentified miscreants lobbed a crude bomb last night.
"We are scared. There also have been robberies in the area. Demand administration to help us," news agency ANI quoted a local as saying.
The state of West Bengal has witnessed incessant violence since before the Lok Sabha elections as workers from the ruling TMC and BJP have clashed on a regular basis.
(More details awaited)