Pakistani police on Thursday arrested and interrogated beleaguered former President Pervez Musharraf in connection with the killing of Baloch leader Akbar Bugti in a 2006 military operation, one of three high-profile cases that have dogged him since he returned to the country from self-exile.

A team of Balochistan Police arrested the former military ruler and grilled him for nearly four hours at his farmhouse on the outskirts of Islamabad, which was declared a “sub-jail” by authorities.

The five-member police team confirmed to reporters outside the sprawling farmhouse that Musharraf had been arrested over the killing of Bugti.

Gen. Musharraf, 69, was the Army Chief when the operation against Bugti was ordered.

Earlier in the day, Judge Chaudhry Habib-ur-Rehman of an anti-terrorism court in Rawalpindi accepted a request from Balochistan Police to include Gen. Musharraf in the probe into Bugti’s death.

Shortly after the judge issued the order, the police team went to Gen. Musharraf’s farmhouse to question him.

Gen. Musharraf is facing charges over the death of Bugti.

A court in Balochistan had issued a warrant for his arrest in 2011.

Since his return to Pakistan in March, Gen. Musharraf has also been arrested for detaining more than 60 judges during the 2007 emergency and over the assassination of former premier Benazir Bhutto.

In a related development, Aftab Ahmed Khan Sherpao, who was Interior Minister in Gen. Musharraf’s regime, appeared in an anti-terrorism court in Quetta for the hearing of a case over Bugti’s killing.