Pakistan's government blamed Islamic extremists, directed by Taliban commander Baitullah Masood, for Bhutto's assassination.
Gilani would not confirm the detention of Masood Azhar, the leader of another militant group, Jaish-e-Muhammad.
The men, who were released, were Maulana Masood Azhar, Ahmed Omar Saeed Sheikh and Mushtaq Zargar.
Earlier Pakistani Defence Minister Ahmad Mukhtar said Jaish-e-Mohammad founder Masood Azhar and Lashkar-e-Taiba commander Zaki-ur-Rehman Lakhvi had been held.
Maulana Masood Azhar and Sheikh Omar, as the latter is known, stayed active.
The militants attacked the back of the compound and were confronted by three police guards, said police officer Masood Afridi.
Talat Masood, who served in Baluchistan multiple times throughout his military career.
Rashid married into the family of Maulana Masood Azhar, founder of Jaish-e-Mohammed.
"Those who have been more moderate, even those people are asking is it worth having a relationship with the U.S.?" Mr. Masood said.
Three senior jobs will be taken by prominent Tajiks associated with the legendary Tajik commander, Ahmad Shah Masood, who was killed in September.
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His Northern Alliance forces control a mere 10% of Afghanistan - a situation which has not been helped by Mr Masood's strategic failures.
"Just getting the macroeconomic fundamentals right isn't enough anymore, " says Masood Ahmed, head of the World Bank's Poverty Reduction and Economic Management Network.
The Taliban say Masood should surrender and join its Islamic government.
The Taleban now control all but the far north of the country, which is the last stronghold of the ethnic Tajik commander Ahmed Shah Masood.
"Her condition is not yet out of danger despite improvement, " Masood Kausar, the governor of the north-western Khyber Pakhtunkhwa province, was also quoted as saying.
Masood, along with other retired officers from Pakistan's armed forces, recently called for the Pakistani leader to step down for the greater good of the country.
India is also asking Pakistan to hand over suspected terrorist Masood Azhar, who was released from an Indian prison in 1999 in exchange for hostages aboard a hijacked Indian airliner.
Kayani's ability to accede to U.S. demands is greatly limited by events like the one Saturday, which stoke anti-U.S. fervor in Pakistan, said Talat Masood, a retired general and defense analyst.
The Taliban is fighting for the 10 percent of Afghanistan controlled by Masood -- the military chief of Burhanuddin Rabbani's ousted government -- who was driven from power in 1996 by the Taliban.
Mr. Masood said he had taped a television chat show Saturday after the attack on the border posts during which he was the only participant arguing that the U.S. wouldn't have targeted Pakistani soldiers in Mohmand as a deliberate act of aggression.
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