American teaching in Sudan was told he was on his own amid violence, mom says: "Sick to my stomach"

As thousands of Americans try to flee Sudan amid a fragile ceasefire, an Arizona mother said her son was told by the U.S. that he was on his own while he tried to make plans to escape.

 "I don't think I've had a decent meal in four days," Joyce Eiler told CBS News.

Eiler said her son, Mike, was teaching in Sudan when violence broke out between two warring factions on April 15. At least 459 people had died as of Tuesday, the U.N.'s World Health Organization said, citing information from the country's health ministry. The true number of deaths is likely significantly higher.