NAGROTA/NEW DELHI: Army chief General Dalbir Singh visited the Nagrota-based 16 Corps headquarters on Wednesday and was briefed about Tuesday’s terror attack in which seven officers and jawans were killed.

Meanwhile, the Border Security Force (BSF) detected a narrow tunnel in Chamliyal area of Jammu on Wednesday, which it suspects may have been used by Pakistani infiltrators who were killed by the force a day before. The channel, which is extremely narrow and seems to be man-made, is the fourth tunnel detected in the Jammu area since 2012.

The BSF suspects the three heavily-armed infiltrators the force killed a day before may have crawled inside India using the tunnel to attack security installations in the area.

After the operation ended at the Chamliyal border outpost, the BSF started checking the fence in order to see where it was breached. The BSF detected an 80-metre long tunnel in Chamliyal area in Ramgarh sub sector of Samba district. This was the fourth such tunnel found along the IB since July 2012 In March this year, a trans-border tunnel originating from Pakistan was detected 30 metres inside India near Allah Mai De Kothe post in RS Pura sector of Jammu district JULY 2012: A 540-meters long trans-border tunnel was detected near Chalyari post of Chachwal village in Samba sector AUGUST 2014: Tunnel that ran 50 meters inside Indian Territory was detected in Pallanwala area of Akhnoor sector.

The Nagrota attack is considered the second biggest attack on an army cantonment after Uri.

The army chief spent around 25 minutes at the site of the encounter before heading back to Delhi. Earlier, he laid wreaths before the mortal remains of the seven soldiers at the technical airport in Jammu. The Nagrota attack is considered the second biggest attack on an army cantonment after the Uri strike on September 18.