The threat letter was purportedly written by one Rajesh, who claimed to be a Maoist sympathiser, and was received last night at Ramanathapuram police station.
It asked the police to take measures to prevent the explosions, police said today.
The Tamil Nadu Q Branch Police have arrested five Maoists recently on the outskirts and three of them are lodged in Central jail here.
Two others -- a couple Roopesh and Shyna -- have been taken to Kerala and lodged in a jail there in connection with some cases against them in the state.
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