A man who prosecutors said was an overseas operative of Al Qaeda during the years following the Sept. 11 attacks was charged in Brooklyn with a host of terrorism charges, in the latest example of a foreigner accused of acts of terrorism abroad being extradited to American courts.

The man, Ibrahim Suleiman Adnan Adam Harun, who was from Saudi Arabia and a citizen of Niger, traveled to Afghanistan shortly before the attacks and stayed there afterward, training in Qaeda terrorist camps and then fighting American and coalition forces during the early years of the Afghan war, prosecutors said.

Mr. Harun, 43, is accused of traveling to Nigeria next to plot attacks against American diplomatic facilities in that country.

The charges include conspiring to murder American citizens, conspiring to bomb United States government facilities and providing material support to Al Qaeda. Court papers do not indicate whether he took steps to carry out attacks.