HANGU : Security forces killed 20 terrorists who attacked them in Kurram Agency in which four security personnel were killed and 12 got injured. Terrorists attacked security forces with heavy weapons in the area of Bara Chamni and martyred 4 soldiers, besides injuring 12. The security forces retaliated and killed twenty terrorists, besides destroying four of their posts. The ISPR said only one constable got martyred and eight were injured in the incident.