As the search for more than 260 kidnapped schoolgirls continued on Wednesday, the government has announced that it refuses to negotiate with the group after a proposal earlier this week for the girls’ return in exchange for a prisoner release.

Nigerian President Goodluck Jonathan met British minister Mark Simmonds, the country’s top official for Africa, on Wednesday. Simmonds later told reports in the capital of Abuja that, “There would be no negotiations with Boko Haram that involves a swap of abducted schoolgirls for prisoners.”

On Tuesday, Boko Haram fighters killed four Nigerian soldiers in an ambush near the school in Chibok from which the girls were abducted.

The girls who managed to escape are in Abuja now, helping officials identify girls in a tape released by Boko Haram earlier this week.