The Islamabad police high-ups are reviewing the progress regarding the investigation on pending cases on daily basis and have been successful in ensuring the completion of the investigations into 321 such cases. The completed investigation reports have been submitted to various courts, said press statement issued here on Thursday. It said Islamabad SSP Muhammad Yousuf Malik had told his subordinates to complete investigation into all the pending cases at the earliest and submit. He had also sough a report on all those cases that had been submitted into the courts concerned. The SSP was told that as many 321 cases were disposed off after the completion of investigation the last ten days and their challans were submitted in the relevant courts.