An anonymous letter claiming that a boat carrying explosives was likely to blow up at Chennai port prompted authorities to tighten security in the area.
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The hand-written letter, posted from Tirunelveli, was received by the port authorities on Saturday, sources said.
Patrolling has been intensified in and around the port while efforts were on to trace the source of the letter, they added. Security has been tightened at exit and entry points of the port.
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