One American, a Texan -- Frederick Buttaccio from the Houston suburb of Katy -- was among the dead. "Fred spent a lifetime experiencing the world and always respecting everyone he met, no matter their position, culture, or religion," the family said in a statement Saturday.French Defense Minister Jean-Yves Le Drian said Saturday that a Frenchman killed, Yann Desjeux, was a former member of the French special forces and part of the security team. The remaining three French nationals who were at the plant are now free, the Foreign Ministry said. The British government said Saturday it is trying to determine the fate of six people from Britain who are either dead or unaccounted for. Prime Minister David Cameron of Britain said, "There is no justification for taking innocent life in this way. Our determination is stronger than ever to work with allies right around the world to root out and defeat this terrorist scourge and those who encourage it." The Norwegian government said there were five Norwegians unaccounted for. Romanian Prime Minister Victor Ponta said Saturday one Romanian hostage was killed in the course of the siege, while the Malaysian government said two of its citizens were still missing. The attack by the Masked Brigade, founded by Algerian militant Moktar Belmoktar, had been in the works for two months, a member of the brigade told the ANI news outlet. He said militants targeted Algeria because they expected the country to support the international effort to root out extremists in neighboring Mali and it was carried out by a special commando unit, "Those Who Signed in Blood," tasked with attacking nations supporting intervention in Mali.