More than 30 people were killed in northwest Pakistan on Sunday in a surge of militant violence which officials said could be aimed at avenging the commando assault on a radical mosque in the capital last week.
Nearly 90 people, most of them paramilitary soldiers and police, have been killed in attacks in the northwest since July 3, when security forces in Islamabad surrounded the Lal Masjid, or Red Mosque, complex following clashes with gunmen.
Following are some of the major incidents of violence in the country since 2006. Most of the bomb and grenade attacks are believed to have been carried out by sectarian or al Qaeda-linked militants. Numerous smaller attacks have taken place.
March 2006 - About 200 tribesmen are killed in clashes in North Waziristan after they answer a call to arms by militant clerics following a special forces assault on an al Qaeda camp.
April 11, 2006 - Fifty-seven people are killed in a suicide bomb attack on a Sunni congregation in a Karachi park.
Oct. 30, 2006 - Army helicopters kill about 80 suspected militants in an attack on a religious school run by a pro-Taliban commander in the Bajaur region bordering Afghanistan.
Nov. 8, 2006 - A suicide bomber kills 42 soldiers at an army training ground in North West Frontier Province (NWFP).
Jan. 27, 2007 - A suicide bomb attack near a mosque in the city of Peshawar kills 15, most of them police officers.
Feb. 17, 2007 - A suicide bomber kills 16 people, including a judge, in Quetta.
April 28, 2007 - A suicide bomber blows himself up at a gathering in Charsadda in NWFP, killing 28. Interior Minister Aftab Ahmed Khan Sherpao escapes with bruises.
May 12-13, 2007 - About 40 people are killed in Karachi in clashes between pro-government and opposition activists as the country's suspended Chief Justice Iftikhar Chaudhry tries to hold a rally.
May 15, 2007 - A suicide bomber blows himself in a Peshawar restaurant, killing 25 people.
July 10, 2007 - Pakistani forces storm the Lal Masjid mosque-religious school complex in Islamabad. At least 75 people are killed, about 60 of them militants. Nine soldiers also died.
July 14, 2007 - A suicide bomber kills 24 Pakistani paramilitary soldiers and wounds up to 30 in the volatile North Waziristan tribal region on the Afghan border.
July 15, 2007 - Blasts hit a convoy of police and paramilitary troops in the Swat district, well known as a stronghold of pro-Taliban militants. Fourteen Pakistanis, including 11 soldiers, are killed.
Eighteen Pakistanis are killed and 60 wounded in a blast at a police recruiting centre in the northwestern city of Dera Ismail Khan.