Pakistan's army is waging an offensive against militants in South Waziristan. The operation has provoked apparent reprisals that have killed more than 500 people since October. A look at some of the major attacks:
_ Jan. 1, 2010: Suicide car bomber kills at least 75 at volleyball tournament in northwest town of Lakki Marwat.
_ Dec. 28, 2009: Bomb blast kills at least 44 at a Shiite procession in southern city of Karachi.
_ Dec. 15, 2009: Suicide car bomber kills 33 near a lawmaker's home in the Punjab province town of Dera Ghazi Khan.
_ Dec. 7, 2009: Two bombs kill 48 at a market in eastern city of Lahore, while a suicide bomber kills 10 people outside a Peshawar court.
_ Dec. 4, 2009: Gunmen and a suicide bomber attack a mosque in a military installation in Rawalpindi, killing 35.
_ Nov. 19, 2009: Suicide bomber kills 19 outside judicial complex in Peshawar.
_ Nov. 14, 2009: Suicide car bomber attacks a police checkpoint in northwest, killing 11.
_ Nov. 13, 2009: Suicide car bomber strikes regional headquarters of the main spy agency in Peshawar, killing 10.
_ Nov. 10, 2009: Suicide car bomber attacks crowded market in northwest, killing 26.
_ Nov. 8, 2009: Suicide bomber hits crowded market in northwest, killing 12.
_ Nov. 2, 2009: Suicide bomber kills 35 outside bank near Pakistan's military headquarters in Rawalpindi.
_ Oct. 28, 2009: Car bomb explodes in a crowded market in Peshawar, killing at least 112.
_ Oct. 16, 2009: Three suicide attackers hit a police station in Peshawar, killing 13.
_ Oct. 15, 2009: Teams of gunmen attack three security facilities in the eastern city of Lahore, leaving 28 dead.
_ Oct. 12, 2009: Suicide car bomb explodes near a market in the northwestern Shangla district, killing 41.
_ Oct. 10, 2009: Raid on the army headquarters in Rawalpindi leads to a 22-hour standoff that leaves nine militants and 14 others dead.
_ Oct. 9, 2009: Suicide car bomb in busy market area in Peshawar kills 53.
(This version CORRECTS toll in Lahore twin blast to 48.)