MARDAN - An assistant sub inspector (ASI) and two suicide bombers were killed while two civilians also injured on Saturday when the militants hurled a hand grenade on a police patrolling party in Katlang Bazaar, district Mardan.Two suicide bombers wanted to target a police mobile party which was on its routine patrolling in Katlong Bazaar. One of them threw a hand grenade on the police. The police party, headed by ASI Khushdil Khan, started firing on the bombers who also threw hand grenades on the law enforcers. As a result, ASI Khushdil Khan died on the spot while two civilians, identified as Salman son of Arsala Khan of Katlang and Hazrat Nabi, 14, son of Hazrat Wali of Landi Shah Katlong, got seriously injured. One of the bombers also got injured and blew himself up. The other bomber climbed up a wall and jumped into a house. The police threw gas shells into the house and also started firing on him. Later, he was hit by a bullet. A heavy police force and high-ups reached the spot. Mardan District Police Officer (DPO) Tahir Ayuab Khan, while talking to The Nation, said a police party in Katlang Bazaar, suspecting two persons on a bike to be terrorists, started firing on them. One of them, who got injured, blew himself up while the other was not a suicide bomber, but his duty was to take the bomber to his target, the DPO said, adding he wanted to escape, but the police also killed him.Nobody has claimed responsibility for the incident. Suspected militants in the past have carried out several bombings in the area. Mardan is the gateway to militancy-hit Swat, Malakand, Buner, Mohmand and Bajaur tribal agencies. The militants have accelerated their activities in Mardan district during the last few weeks. On February 16, a suicide bomber targeted a convoy of former chief minister Amir Haider Khan Hoti in front of Abdul Wali Khan University, but it remained safe. Militants killed two policemen on last Wednesday late night in the limits of Jabbar police station. On Thursday night, they also targeted a private college in the limits of Par Hoti police station. There have been suicide attacks, bombings and rocket attacks in Mardan city in the past while a number of educational institutions have been blown up by the militants.Staff Reporter from Peshawar adds: A low-intensity explosion slightly damaged an office of a non-governmental organisation working for women rights in Peshawar in the wee hours of Saturday, police officials said, luckily no casualty was reported. According to officials, unidentified miscreants had planted a bomb along the outer wall of Sawera in the posh locality of Hayatabad. The bomb went off at around 4:00am creating panic in the area, they said, adding that no casualty or any injury was reported in the blast, but the NGO office was partially damaged. Soon after the blast, a police party rushed and initiated an investigation into the incident. There were no reports of any threats to this NGO.  However, NGOs have been targeted in Peshawar in the past.