FACTBOX: 2007's deadliest bomb attacks

(Reuters) - The Pakistan government blamed Islamist militants for a grenade and suicide bomb attack early on Friday that killed 133 people as opposition leader Benazir Bhutto drove through masses of supporters in Karachi.

It is the most deadly bomb attack outside Iraq this year.

Here is an overview of some of 2007's deadliest bomb attacks, listed in order of death toll.

IRAQ:

-- About 520 people are killed on August 14 when suicide bombers drive two garbage trucks packed with explosives into two villages in northwestern Iraq that are inhabited by minority sect Yazidi.

IRAQ:

-- Multiple car bombings kill 191 people around Baghdad on April 18. The most deadly bomb hits a popular market in the central Sadriya neighborhood, killing 140 people.

IRAQ:

-- About 152 people are killed when a truck bomb explodes in Tal Afar, close to the Syrian border and the regional capital of Mosul, on March 27.

IRAQ:

-- A truck bomb kills at least 150 people and wounds 250 in a crowded market in the northern town of Tuz Khurmato on July 7.

IRAQ:

-- Truck bomb kills 135 people and wounds 305 at a market in the Sadriya quarter of central Baghdad on February 3.

PAKISTAN:

-- A suspected suicide bomber kills 133 people as crowds gather to greet former Prime Minister Benazir Bhutto in Karachi on October 19 as she returns from eight years of self-imposed exile.

Sources: Reuters