TIMELINE: Major bomb attacks in Pakistan

(Reuters) - Two suicide car bombers struck in the Pakistani city of Lahore on Tuesday, killing 24 people and wounding scores, most of them in an attack on a government security office, police and officials said.

More than 500 people have been killed in Pakistan this year in militant-related violence, including a campaign of suicide bombings.

Here is a chronology of some of the worst bomb attacks since July 2007:

July 14, 2007 - Suicide car-bomber kills 24 paramilitary soldiers and wounds 29 in North Waziristan.

July 15 - Sixteen people, most of them paramilitary soldiers, are killed in suicide-bomb ambush on patrol in Swat Valley in North West Frontier Province (NWFP). Separately, suicide bomber targets police recruits in Dera Ismail Khan in NWFP, killing 29.

July 17 - Suicide bomber kills 16 people outside court in Islamabad where country's suspended chief justice, Iftikhar Chaudhry, was due to speak.

July 19 - Three suicide attacks in a single day in three towns kill at least 52 people.

July 27 - Suicide bomb attack in a restaurant near Islamabad's Red Mosque kills 13 people, most of them policemen.

September 4 - Two suicide bombers kill 25 in Rawalpindi.