It is said that these terrorists were spotted in 30 places along the Loc.
"They are camping in concrete structures, mostly houses.
These camps are not huts. These camps have been clearly identified by Indian security forces," reports said.
The sources said that efforts were made so that the terrorists enter before winter snowfall.
"The next two months are crucial," they said, expecting a jump in the infiltration attempts.
In the recent times, there have been a number of attempts at infiltration, many times accompanied by firing from across the LoC to provide cover to such bids.
In Aug 2009, security forces killed at least 25 terrorists and these encounters took place at points along the LoC.