Ms Sitharaman, who addressed the media after a visit to Sunjuwan Army Camp that was attacked by terrorists, said it was located on Jammu's outskirts and only 30 km from the International Border in a semi-urbanised environment with densely populated civilian infrastructure adjacent to its perimeter wall.
"The demography of the cantonment and adjoining area indicates the possibility of local support to terrorists. An alert had been sounded on the likelihood of a terrorist attack around this period," she said.
She said Rs 1,487 crore have been allocated to enhance security at these defence installations.
Ms Sitharaman said military stations all over the country are facing the problem of civilian constructions coming up too close to them.
"Whether these have to be removed or not because they are also being made with permission... we are doing a study throughout the country on what is happening near the peripheral walls. Certainly, we will take action," she said.
Ms Sitharaman said the activities of terrorists in the hinterland were severely curtailed due to the relentless efforts of the security forces. She said terrain configuration on the borders and snow conditions make it difficult to completely stop infiltrations.
"The government is taking a host of steps in procuring modern electronic surveillance systems to implement the report of Philip Campose committee that was set up to review security at all military installations, for which Rs 1,487 crore has been allocated," the Defence Minister said.