Quoting intelligence inputs, government sources said there is high probability of terror attacks being carried out by militants who have already sneaked into Jammu and Kashmir following instructions from their masters based in Pakistan.
These attacks may target mostly security forces serving in the Kashmir Valley and civilian areas in Jammu region.
"We have put security forces in Jammu and Kashmir on high alert and asked them to be extra vigilant taking into account the prevailing situation," a source said.
They said evacuation of civilians in some areas in Jammu and Kashmir and in Punjab has been done and they will not return till the situation becomes normal.
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The sources also said the Indian soldier, who inadvertently crossed over to Pakistan, could be a "deserter" as he walked out of a group of soldiers and strayed into the Pakistani territory.
Army sources had said yesterday that "one soldier from 37 RR with weapon has inadvertently crossed over to the other side of the Line of Control. Pakistan has been informed by the DGMO on the hotline."
India carried out 'surgical strikes' on terror launch pads across LoC on the intervening night of September 28 and 29, inflicting "significant casualties" on terrorists and those who are trying to support them.
The announcement of the sudden action by the Army was made yesterday by DGMO Lt Gen Ranbir Singh, 11 days after the terror strike by Pakistan-based JeM on an Indian Army camp in Uri in Kashmir which left 19 Indian soldiers dead.