A senior bureaucrat said on Saturday he helped rig Pakistan’s elections, a week after polls marred by allegations of manipulation returned no clear winner. Liaqat Ali Chattha, commissioner of the garrison city of Rawalpindi, where the country’s powerful military has its headquarters, said he would hand himself over to police. There have been widespread allegations of rigging after authorities switched off the country’s mobile phone network on election day and the count took more than 24 hours. The army-backed Pakistan Muslim League-Nawaz (PML-N), short of a majority, has announced a partnershi…