The United Nations said 12 German troops and a Belgian soldier serving in the U.N. peacekeeping mission in Mali were wounded Friday in an attack in the country's north. German Defense Minister Annegret Kramp-Karrenbauer said three of the soldiers were seriously wounded. She told reporters in Bonn, Germany, that two soldiers were in a stable condition while the third was still undergoing surgery. All of the wounded soldiers were flown by helicopter to Gao, where they were being treated at German, French and Chinese medical facilities, AP quoted the minister as saying.