A BSF team, probing the intrusion of four Jaish-e-Mohammed terrorists killed recently at Nagrota in Jammu, had gone 200 metres inside Pakistani territory to find the mouth of a cross-border underground tunnel used by extremists to enter into India, top officials said on Tuesday.

Immediately after the four Jaish terrorists were shot dead in a gunfight on November 19, the BSF, which mans the International Border in Jammu region, formed the crack team to explore the possible route taken by them.