Michael E. O'Hanlon and Jason H. Campbell of the Brookings Institution stated on December 22, 2007 that Iraq's security environment had reached its best levels since early 2004 and credited Petraeus' strategy for the improvement.[1] CNN stated that month that the monthly death rate for US troops in Iraq had hit its second lowest point during the entire course of the war. Military representatives attributed the successful reduction of violence and casualties directly to the troop surge. At the same time, the Iraqi Ministry of Interior reported similar reductions for civilian deaths.[74]