US troops handed over security duties to Iraqi forces in June 2009, though they continued to work with Iraqi forces after the pullout. On the morning of 18 December 2011, the final contingent of US troops to be withdrawn ceremonially exited over the border to Kuwait. Crime and violence initially spiked in the months following the US withdrawal from cities in mid-2009 but despite the initial increase in violence, in November 2009, Iraqi Interior Ministry officials reported that the civilian death toll in Iraq fell to its lowest level since the 2003 invasion.