Boko Haram activists raided a border village in Niger, killing four people and torching some 50 homes, a local official said on Monday. Two other people were wounded in the assault on Saturday evening, said Fougou Boukar, an official from the restive Diffa region, adding that the attackers then fled to Nigeria. "There has been enormous damage with about 50 houses burnt," he told state television, putting the number of assailants at about 10. "The Boko Haram members were armed with Kalashnikovs and came across the Komadougou Yobe" river that divides Niger and Nigeria, Boukar said.