The fighters killed four civilians and a soldier in the predawn attack on the fishing village of Ngouboua on the shores of Lake Chad, according to residents and Chadian security sources.
The attack came hours after 21 people were killed in two separate attacks on Akida and Mbuta villages near the northeast Nigerian city of Maiduguri, according to residents and a local community leader.
Adrian Edwards, spokesman for the U.N. High Commissioner for Refugees, told reporters in Geneva, Switzerland, that news had come in overnight of the attack on Ngouboua and details remained hazy.
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The Chadian soldiers were deployed to fight Boko Haram in Cameroon and Nigeria.
CNN’s Lucy Pawle and Radina Gigova contributed to this report.
