Pakistan-Afghanistan border crossings at Torkham and Chaman have been closed for all sorts of traffic.
Several banned terrorist organizations, including Tehrik-e-Taliban Pakistan and Jamaat-ul-Ahrar are based in Afghanistan, and they have been carrying subversive activities in Pakistan from there.
Security forces have increased patrolling, surveillance and checking on check posts along the Pak-Afghan border.
Meanwhile, several terrorists were killed in an exchange of firing with security forces in Khyber Agency on Friday.
According to Inter-Services Public Relations (ISPR), the terrorists attacked Pakistani border post in the agency from the Afghan side.
Two FC soldiers were also martyred in the attack.