Two-time prime minister Bhutto survived the suicide bombing on a procession in Karachi after she arrived home on Oct. 18, but nearly other 140 people were killed.
Bhutto was assassinated in a gun and bomb attack in the city of Rawalpindi on Dec. 27.
Interior Minister Hamid Nawaz told Reuters the suspect, Qari Saifullah Akhtar, was arrested early on Tuesday, along with his three sons, and was being interrogated about the Karachi attack.
"He was involved in the Karsaz bomb blast," the minister said, referring to an overpass in Karachi where the attack on Bhutto took place.
In her book, Reconciliation, published after her murder, Bhutto identified Akhtar as a "wanted terrorist" who tried to overthrow her second government in the 1990s.
She also said he was involved in preparing the bomb attack on her procession in Karachi.
Hashmat Habib, a lawyer for Akhtar, said he was arrested at a Muslim shrine near the eastern city of Lahore.
A former chief of the banned Harkat-ul-Ansar group, Akhtar ran a training camp in Afghanistan, a security official said.
Akhtar was sent by the UAE to Pakistan in 2004 and was arrested and detained, but he was released in 2007, the lawyer said.
Police have arrested four suspects in connection with Bhutto's assassination.
Güncelleme Tarihi: 27 Şubat 2008, 10:08