A Nigerian fighter jet misfired Tuesday during an operation, striking refugees at a camp for the internally displaced as well as aid workers with the International Committee of the Red Cross ICRC, according to Nigerian officials and the Red Cross.

The Nigerian government provided no official death toll, but an aid organization said more than 50 people were killed at the camp in the northeastern state of Borno.

ICRC Africa confirmed on Twitter that six Nigerian Red Cross staffers had been killed and scores of others wounded.