A bomb detection squad scanned the Vriddhachalam railway station on Monday after officials received a threat letter three days ago.
The letter said that bombs will be planted in the station or trains if those arrested in connection with Advani pipe bomb case are not released within 25 days.
The letter, apparently sent from Tirupur, also had a mention of ‘al-Ummah, Madurai’, official sources said.
Though the letter was received by the station master on Friday, the officials delayed search operations seeking permission from higher-ups. The station master had forwarded the letter to the regional headquarters (Tiruchy), the sources added.
The letter also said that liquor, ganja and a huge amount of money were being smuggled in trains passing through Vriddhachalam and this trend has to be stopped immediately.
“These demands should be met within 25 days, otherwise bombs will be kept at Vriddhachalam Railway Station or in trains that pass through Vriddhachalam,” the letter said.
Searches started on Monday after station master Issac handed over the letter to the police. Ten members of the bomb detection squad is camping at the station and are conducting searches, the sources added.