terrorist groups get their supply of arms and ammunition from Sri Lanka to use against India
Due to the increased vigil by the Indian security forces on all the possible land routes of infiltration, the terrorist organizations are reportedly busy in searching other routes to infiltrate in India now. The previous tried and tested land routes have become difficult to cross now.
High security measures in those areas have resulted in major losses for terrorist organizations and the terror outfits such as the Lashkar-e-Toiba has tried to explore new routes and the sea route has become most preferable route for them...
...According to the Intelligence Bureau, terrorists start on boats from Karachi in Pakistan to reach Jafna in Sri Lanka. The terrorists get their supply of arms and ammunition From Sri Lanka to use against India....
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http://www.indiadaily.org/entry/
terrorists-preferring-karachi-jafna-chennai-sea-route-now/