Human Rights Watch has released a tape of an interview with the Pakistani AG saying this.

It appears that they were conducting a phone interview, and than Attorney General Malik Qayyum initiated a second phone call without terminating the first, and he was recorded saying, “They will massively rig to get their own people to win.”

Oops.

It appears fairly likely from the whole conversation that the “they” in question is Pervez Musharraf’s Pakistan Muslim League-Q party.