Pakistan's top court has ordered the arrest of the prime minister in a corruption case, adding to the country's political turmoil .
The Supreme Court's order was related to a case involving private power stations set up to provide electricity. The judges are investigating allegations that the bidding process was marred by corruption.
Chief Justice Iftikhar Chaudhry ordered the arrest of several people involved in the case, including prime minister Pervaiz Ashraf, who previously served as minister for water and power.
An adviser to the prime minister, Fawad Chaudhry, said the country's attorney general, Irfan Qadir, called Mr Ashraf to notify him that the chief justice had suggested he be arrested during a hearing into the case.
The adviser said any attempt to arrest the prime minister would be unconstitutional since he enjoys immunity from prosecution while in office.
The court developments could provide ammunition for Tahir-ul-Qadri, a fiery Muslim cleric who is leading a massive protest rally in Islamabad to press for the removal of the government, which he claims is made up of thieving politicians.