Authorities arrested two more suspects Thursday in the suicide attack that assassinated opposition leader Benazir Bhutto, an official said.

Interior Ministry spokesman Javed Iqbal Cheema said the two men were arrested in Rawalpindi where Bhutto died in a gun and bomb attack on Dec. 27.

The arrests were disclosed hours after team of Scotland Yard investigators returned to Pakistan to share the conclusions of their probe into the former prime minister's killing.

Last month, authorities in northwestern Pakistan said they had arrested two suspects, including a 15-year old boy who was alleged to have been part of the suicide squad assigned to kill her.