Mohammed Maliya, who is part of the rescue effort in the town of Biu, says the victims were killed when one of the women detonated her explosives at a food distribution point run by a non-governmental organisation.
She appeared relaxed and was eating a banana while waiting in line with others, Maliya says.
The other bomber killed only herself but wounded a number of people.
Today's attack took place about 185 kilometers (115 miles) from Maiduguri city, where the Islamic extremist group Boko Haram was formed.
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