Mimi Ould Baba, 32, scouted attack locations for Al Qaeda in the Islamic Maghreb and arranged the transport of assault rifles and hand grenades used in the attack on a hotel and cafe in Burkina Faso's capital of Ouagadougou, authorities alleged in a criminal complaint.
The shooting killed 45-year-old Michael J. Riddering, an American missionary who had been eating dinner with a local pastor at Café Cappuccino when the attackers opened fire with AK-47s.
The attack lasted for nearly 12 hours and killed people from 18 different countries, including the wife and young daughter of the Italian cafe owner, two French citizens, two Swiss citizens and six Canadians. All three gunmen were killed.
Several weeks after the Burkina Faso shooting, prosecutors said, Baba also helped plan a similar Al Qaeda attack on Westerners in Ivory Coast. In that attack, three men armed with hand grenades and AK-47s walked along a beach in Grand Bassam and opened fire. Nineteen people were killed.
The criminal complaint says U.S authorities interviewed Baba in 2017. The document says Baba "did not consider himself a jihadist but was willing to assist Al Qaeda for monetary reasons."
Riddering managed a yacht outfitting company in Florida before he and his wife, a graphic designer, sold their possessions in 2011 to move to Burkina Faso, where they ran an orphanage, school, clinic and women's center housing dozens of children and widows. He was buried in Burkina Faso.
Baba, 32, was captured in 2017 in Mali, where he remains in custody and is being prosecuted. Mali has no extradition treaty with the United States.
“We fully support the Malian investigation and prosecution of Baba and will continue to work with the authorities there to pursue our shared goal of holding Baba accountable for his crimes,” Assistant Attorney General for National Security John C. Demers said in a DOJ press release.
The Associated Press contributed to this report.