Chairman Pakistan Tehreek-i-Insaf (PTI) Imran Khan, while condemning police's interference in by-poll of PP 81 constituency, said on Saturday he will write to Chief Election Commissioner and Inspector General (IG) Punjab. Imran Khan claimed that his party's campaigning at Shah Jiona area has deprived Pakistan Muslim League-Nawaz (PML-N) leadership of sleep. He alleged that Punjab government is busy plotting rigging in by-polls and harassing his party workers through police.