Ahmedabad: A letter to the Ahmedabad Railway Station Manager warning of bombs planted on two trains sent security agencies into a tizzy today, though it later turned out to be a hoax.

"We received a letter today, addressed to the station manager, about bombs planted on Kamakhya Express and Merusagar Express. It also said that bombs were planted on the city railway station in Kalupur area here," Western Railway PRO Pradeep Sharma said.