The BBC reported that Baitullah Mehsud allegedly was the mastermind behind the former prime minister's slaying. Mehsud and the four other suspects remain at large.

The latest charges bring to 10 the number of suspects in the Dec. 27, 2007, bombing attack, the British network reported.

Baitullah Mehsud, based in South Waziristan, has denied any involvement in the assassination.

Last month, police said cousins Rufukat and Husnan Gul had confessed to giving Bhutto's attacker a bomb vest and a pistol, BBC reported.