Pakistan Muslim League-Nawaz (PML-N) Chief Nawaz Sharif has said that the government is not serious over the PNS Mehran attack and urged that an independent commission should be formed to probe the biggest ever terrorists assault on any military installation. Nawaz while talking to media before leaving for Nawab Shah to condole the death of President Asif Ali Zardaris father Hakim Ali Zardari , said that the issue of PNS Mehran should be taken serious like the Abbottabad operation. He added that the government did not respond opposition leader Chaudhry Nisar 's letter regarding formation of commission into the Abbottabad operation.