updated 2/13/2008 3:12:45 PM ET 2008-02-13T20:12:45

An Islamic militant who helped carry out the assassination of former Prime Minister Benazir Bhutto wanted to avenge the death of a friend in the military attack against the Red Mosque in Islamabad last year, a senior police officer said Wednesday.

Husnain Gul and his cousin, identified only as Rafaqat, were arrested last week in the Dec. 27 death of Bhutto, who was killed in a gun and suicide bomb attack at the end of a political rally in Rawalpindi.

The senior policeman leading the murder investigation, Chaudhry Abdul Majeed, told reporters that Gul began preparing for the attack in November.

His friend had been killed in military operations against Islamic militants holed up inside Islamabad's Lal Masjid, or Red Mosque, in July. About 100 people died in the siege.

Majeed said Gul was involved in three other suicide bombings in Rawalpindi.

Majeed said that Gul and his cousin told investigators details of the plot against Bhutto.

Based on that testimony, Majeed said, police have learned that two assailants were stationed at a pair of gates to the park where thousands of Bhutto supporters had gathered.

The primary assailant was identified only as Saeed, who was using the alias Bilal.

Majeed said Bilal opened fire with a pistol and then detonated explosives hidden beneath his clothing, fatally injuring Bhutto.

The other assailant, identified only as Ikramullah, was to have attacked Bhutto if she had escaped the first blast. With the first bomb proving fatal, Ikramullah left Rawalpindi the next morning, Majeed said, without saying where.

On the eve of the attack, the two suicide bombers spent the night at Gul's home in Rawalpindi, Majeed said. Gul gave Bilal his sunglasses and drove the two bombers to the public park where the attack occurred, Majeed said.

"Their motive for attacking Bhutto was that she was coming to Pakistan at the behest of a foreign power," Majeed said.

Four people, including a 15-year-old boy, have been arrested in the probe. Majeed said a fifth suspect is being sought but he refused to elaborate.

Majeed also would not speculate on the mastermind of the assassination. U.S. and Pakistani officials suspect the attack was ordered by Baitullah Mehsud, an al-Qaida-linked extremist in northwest Pakistan.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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