Following a bomb threat letter received by the Station Manager of Central Railway station on Tuesday, the Government Railway Police has filed a case and investigation is under progress.
A police official of the Government Railway Police said a letter was received by the Station Manager of Central Railway station claiming bombs had been planted on four trains.
The letter signed off by ‘Maoists’ stated bombs would go off in the Nilgiris and Mangalore trains near Arakkonam and Thoothukudi and Nellai trains near Melmaruvathur, he added.