LIBREVILLE (Reuters) - An attacker wielding a knife and crying  Allahu Akbar  has wounded two Danish journalists in Gabon s capital Libreville, the Gabonese defense minister said. The two reporters for the National Geographic channel were in a popular market for tourist souvenirs on Saturday, when a Nigerien national living in Gabon lunged at them with the knife, Defence Minister Etienne Kabinda Makaga said in a statement on Gabonese television. After his arrest, the 53-year-old suspect, who has lived in Gabon for two decades, told authorities he was carrying out a revenge attack against America for recognizing Israel s capital as Jerusalem, Makaga said, giving no further explanation.  A judicial investigation was immediately opened at the public prosecutor s office of Libreville to establish if the acts of the aggressor were isolated or a conspiracy,  Makaga said. Oil-rich Gabon has a small Muslim population consisting mostly of foreign workers, although the precise number is not known. It is not normally considered a high risk country for jihadist violence.   (This story corrects to make clear attacker was  Nigerien  from Niger, not  Nigerian  from Nigeria) 