In a message to the nation, President Roch Marc Christian Kabore said the people of Burkina Faso must unite in the fight against terrorism.
He also announced on the national broadcaster, Burkina 24, that security forces would be stepping up their efforts to thwart future attacks and asked people to comply with the new restrictions.
The national mourning began today, a day after Burkinabe and French forces ended a more than 12-hour siege at the upscale Splendid Hotel in downtown Ouagadougou.
When the gunfire and explosions finally stopped, authorities said 18 were killed in the hotel and 10 were killed at the nearby Cappucino Cafe.
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Among the victims were the wife and young daughter of Italian Gaetan Santomano, who owned the cafe. Government officials say the toll also includes six Canadians, five Burkinabes, two Swiss nationals, two French citizens and one American.
He is survived by his four children, two of whom were adopted from Burkina Faso.
Riddering was "a wonderful, godly man" who managed to find spare time to help teams of volunteers from other organizations who dug wells for local residents, said John Anderson, a board member of Sheltering Wings, Riddering's charity.
"During the Ebola crisis, when it was hard to find people to do the digging, Mike would go out and join them so they could continue doing the work," Anderson said. "And that's backbreaking work. He never stopped moving and never stopped helping."
The al-Qaida group claiming responsibility for the carnage released an audio tape titled: "A Message Signed with Blood and Body Parts."
Today, French authorities were back at the scene carrying out a forensic investigation. Special forces from the former colonizer came during the overnight siege from their base in neighboring Mali to help Burkina Faso's military put an end to the killings.