Nigeria’s military chiefs and the president are apparently split over how to free nearly 300 schoolgirls abducted by Islamic extremists, with the military saying use of force endangers the hostages and the president reportedly ruling out a prisoner-hostage swap.

The defense chief, Air Marshal Alex Badeh, announced Monday night that the military has located the girls, but offered no details or a way forward. “We can’t go and kill our girls in the name of trying to get them back,” he said.

Previous military attempts to free hostages have led to the prisoners being killed by their abductors, including the deaths of two engineers, a Briton and an Italian, in Sokoto in March 2012.

A human rights activist close to mediators said a swap of detained extremists for the girls was negotiated a week ago but fell through because President Goodluck Jonathan refused to consider an exchange. The activist spoke to reporters on condition of anonymity because the activist is not permitted to speak to press.

Britain’s minister for Africa, Mark Simmonds, said two weeks ago that the Nigerian leader had told him categorically he would not consider a prisoner swap.

Community leader Pogu Bitrus of Chibok, the town from which the girls were abducted April 15, says authorities are speaking with “discordant voices” and the president appears under pressure to negotiate.

“The pressure is there if his own lieutenants are saying one (thing). Because if they cannot use force, the deduction is that there must be negotiation,” Bitrus said. “And if their commander-in-chief, the president, is saying that he will not negotiate, then they are not on the same page.”

Nigeria’s military and government have faced national and international outrage over their failure to rescue the girls seized by Boko Haram militants from a remote northeastern school six weeks ago.

Jonathan finally accepted international help. American planes have been searching for the girls and Britain, France, Israel and other countries have sent experts in surveillance and hostage negotiation.

A Boko Haram video shows some of the kidnapped girls reciting Quranic verses in Arabic and two of them explaining why they had converted from Christianity to Islam in captivity. Unverified reports indicate that two may have died of snake bites, that some have been forced to marry their abductors and that others may have been taken across borders into Chad and Cameroon.

Suspected Boko Haram gunmen have killed 54 people in two separate attacks in northeastern Nigeria, local officials said Tuesday.

Boko Haram — the nickname means “Western education is sinful” — believes Western influences have corrupted Nigerian society and wants to install an Islamic state under strict Shariah law. Nigeria’s population of 170 million people is divided almost equally between Christians and Muslims.