A plane crashed north of the Republic of Congo capital, killing 13 passengers and crew, including four Ukrainians, officials said Saturday. The Ukrainian-built Antonov 26, registered by Air Kasai in neighboring Congo, went down 50 kilometers (31 miles) north of Brazzaville on Friday afternoon, government spokesman Alain Akoula said. Rescue workers found 13 dead bodies, including the four-person Ukrainian crew, he said. The cause of the crash was not immediately clear. The plane had taken off from an airstrip in Congo's Equateur province and was bound for that country's capital, Kinshasa, after flying over eastern territory of the Republic of Congo.