Secretary of Defense Chuck Hagel said Wednesday that the U.S. is using surveillance drones to try to locate more than 270 kidnapped schoolgirls in Nigeria.

"We are now providing unmanned reconnaissance intelligence over Nigeria and we'll continue to do that," Hagel told reporters in Saudi Arabia at a meeting of the Gulf Cooperation Council.

The Wall Street Journal reports: "The American drones will be flying over Nigeria along with a piloted U.S. reconnaissance plane as part of an effort that also includes more than two dozen specialists sent by Washington to aid the Nigerian government in the search."

Meanwhile, Nigeria's President Goodluck Jonathan has reportedly rejected a possible swap of Islamic militants for the return of the girls, who were abducted on April 15 by Boko Haram militants in the northeastern town of Chibok.

Jonathan has "made it very clear that there will be no negotiation with Boko Haram that involves a swap of abducted schoolgirls for prisoners," Mark Simmonds, British Foreign Office minister, told journalists in the Nigerian capital, Abuja, according to The Associated Press.

Copyright 2016 NPR. To see more, visit