U.S. issues travel warning for Chad WASHINGTON, March 30 (UPI) -- U.S. government personnel are advised against traveling outside the Chadian capital given the "highly variable" security situation, the State Department said. The U.S. State Department, in a travel advisory, warned against traveling to eastern Chad and the border region. "High levels of violent crime and a continuing risk of clashes between the Chadian government and armed groups exist in these areas," the warning read."In particular, there is a heightened risk of carjacking and kidnapping for ransom within these conflict zones." The advisory added that U.S. government personnel are prohibited from traveling outside the capital without authorization. All U.S. citizens in Chad are advised to prepare for evacuation on short notice. "The incidence of violent crime in rural Chad is highly variable," the warning added. The security situation in neighboring Libya, Sudan, Central Africa Republic and Nigeria is especially tense.