NAB freezes immovable assets of Shehbaz, family

* Eight properties of PML-N chief, 15 of Hamza and Suleman Shehbaz frozen in Lahore, Chiniot, Haripur and Abbottabad
* Ahsan Iqbal says NAB move suggests govt is not serious in legislating on COAS tenure
* Dr Firdous says opposition trying to escape as legislation phase draws nearer