The border districts of Pathankot and Gurdaspur were put on a high alert after two motorcycle-borne men lobbed a low-intensity hand grenade towards an army camp in Pathankot on Sunday night.
Police officials, after a preliminary inquiry, termed the incident as a terror attack.
No casualties were reported. The police have sounded an alert.
By Monday morning, security in Pathankot was increased. The ammunition dump at Mamun Cantt was also secured.
SSP Surendra Lamba with a team of police officials reached the site after which orders were given to set up a dozen check posts in the district.
The attack occurred barely 500 yards from the outer wall of the high-security Air Force station.
On January 2, 2016, four Jaish-e-Mohammad militants had laid siege to the air base. A 48-hour fierce gun battle had followed in which all terrorists were killed.