Burkina Faso began three days of national mourning Sunday and the president said security would be stepped up in the capital and the country's borders after al-Qaida militants killed at least 28 people in an attack on a hotel and cafe popular with foreigners.

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.

"These truly barbaric criminal acts carried out against innocent people, claimed by the criminal organization al-Qaida in the Islamic Maghreb (AQIM) seek to destabilize our country and its republican institutions, and to undermine efforts to build a democratic, quiet and prosperous nation," said Kabore.

The national mourning began Sunday, 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 Cappuccino Cafe.

Among the victims was a Ukrainian woman who was co-owner of the cafe with her Italian husband, Gaetano Santomenna, according to Ukrainian officials. Although Santomenna was not at the cafe and survived the attack, the couple's son, Michel Santomenna, 9, was killed, according to the Italian foreign ministry. Italy's foreign minister, Paolo Gentiloni, called the child's death "a horrendous crime," in a tweet which also expressed sympathy with the boy's father.

The toll also includes six Canadians, according to Canada officials. The Canadian Press reported that the six were traveling together as part of a humanitarian mission, four them were from the same family.

Others killed include seven citizens of Burkina Faso, two Ukrainians, two Swiss, two French and one each from the U.S., the Netherlands, Portugal and Libya, and one French-Ukrainian, according to Burkina Faso officials who released a partial list. Other bodies were being identified.

The American '€” Michael Riddering, 45, of Cooper City, Florida '€” had been working as a missionary in Burkina Faso since 2011, where he and his wife ran an orphanage that also provided shelter to abused women and widows. He is survived by his four children, two of whom were adopted from Burkina Faso.

White House National Security Council Spokesperson Ned Price said Riddering "had devoted his life to working with the Burkinabe people" in a statement strongly condemning the recent terrorist attacks in Burkina Faso and mourning those killed "in these senseless acts of violence."

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."

Swiss authorities said its two nationals who were killed were also in Burkina Faso for humanitarian reasons.

The al-Qaida group claiming responsibility for the carnage released an audio tape titled: "A Message Signed with Blood and Body Parts."

On Sunday, 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.

Some guests returned to the Splendid Hotel to pick up their luggage and other belongings left behind when guests fled for their lives when the gunmen began firing to kill as many people as possible.

The attack, which began around 7:30 p.m. Friday, was the first of its kind in Burkina Faso, a largely Muslim country that had managed to avoid the kinds of jihadist attacks that have destabilized neighboring Mali since 2012.

In a separate incident two Australian humanitarian workers were kidnapped by extremists in northern Burkina Faso. Surgeon Ken Elliott and his wife Jocelyn were abducted Friday. The couple, reported to be in their 80s, were kidnapped in the northern town of Djibo where they had run a medical center for 40 years. (kes)(+)

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Associated Press writers Stephanie Siek in New York and Frances D'Emilio in Rome contributed to this report.

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