"Each student will receive a formal invitation to which he will have to respond in a written formal manner and not by email, text message or phone," the spokesman said .

AFRICOM speaks to right US motives, but is it the best spokesman?

"We do not have any information that he has left the country, " a spokesman said.

He is the spokesman of the council.

Pentagon officials, however, said they believed he remained in Libya. "We do not have any information that he has left the country," a spokesman said.