From the U.S. State Department:

The U.S. Department of State warns U.S. citizens against all travel to Mali at this time because of fluid political conditions, the loss of government control of Mali’s northern provinces, and continuing threats of attacks and kidnappings of Westerners in the north of the country. Mali’s path toward stabilized legitimate governance has clarified considerably since the March 21 military coup, and in particular with the installation of an expanded interim government on August 20. Effective August 29, the Department of State is lifting the Authorized Departure of non-emergency personnel and all eligible family members of U.S. Embassy personnel. While the security situation in Bamkao is improving, the country faces continued challenges including food shortages, internally displaced persons, and the presence in northern Mali of factions linked to Al-Qaeda in the Islamic Maghreb (AQIM). ....

U.S. State Department Warning