The police arrested former military ruler over the charges of an Islamist cleric Abdul Rashid Ghazi killed during the Red Mosque operation, week long stand off between the radicals and military in 2007.
Earlier, Musharraf was granted bail in Benazir Bhutto's assassination case, killing of a senior tribal elder Nawab Akbar Bugti in 2006 and placing top judges illegally under house arrest during his rule.
Also, the apex court had ordered the government to question Musharraf as to why he had dismissed an elected government and in what circumstances he had suspended the constitutions in 2007.
The interior minister said the Federal Investigation Agency has been directed to accelerate investigation into the treason case against the former president and would present the report as soon as possible.
He said the investigators have been directed to complete investigation in six weeks.
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