US experts have arrived in Nigeria to help rescue more than 200 schoolgirls being held hostage by Boko Haram Islamists, an embassy spokeswoman told AFP on Friday.#

"They are here...the team is on the ground," Rhonda Ferguson-Augustus said, without specifying the precise make-up of the group. US officials have previously said Washington would send military personnel as well as specialists from the Justice Department and the FBI.