Thanh's brief period as Prime Minister ended on 15 October 1972, shortly after an assassination attempt widely believed to have been organised by Lon Non. The PSR's Secretary-General, Hang Thun Hak, was made Prime Minister in his place, but was to be forced out in early 1973 after a period of increasingly poor outcomes for the Republic in the Cambodian Civil War. After a period in which In Tam served in the post, PSR member Long Boret was made Prime Minister in late 1973.