Friday's twin attacks on the French embassy and the country's military headquarters in the capital saw seven soldiers killed, which was a new toll after eight had previously been declared dead.
The group identified as Jama'a Nusrat ul-Islam wa al-Muslimin (JNIM) carried out the attack in response to the killing of one of its leaders, Mohamed Hacen al-Ancari, in a recent raid by French forces according to Mauritanian news agency Alakhbar. In a phone call to President Roch Marc Christian Kaboré, the Secretary-General expressed solidarity with the Government and people of Burkina Faso.
The Paris prosecutor's office said it has opened a preliminary attempted murder investigation into the attack because the embassy was among the targets, a French judicial official said on condition of anonymity because he is not authorised to talk to the media identified.
The embassy attackers were armed with Kalashnikov assault rifles and were "dressed in civilian clothes" with their faces uncovered, witnessed said.
Around the same time, at least one explosion occurred near the army headquarters and the French cultural centre, about half a mile from the embassy.
"We are really revolted by this insecurity and we must point the finger at those who are responsible."Security was reinforced near strategic sites in Ouagadougou on Saturday as Prime Minister Paul Kaba Thieba, flanked by ministers from his government, toured the army headquarters and the French embassy".
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Burkina Faso also saw a failed coup in 2015. Forces backed by the French military have failed to capture Dicko.
"After soft targets, such as hotels and restaurants, this attack aimed at hard targets, strong symbols", he said, adding there appeared to be "a problem at the intelligence level".
That meeting had been moved to a different room, otherwise the death toll could have been far higher.
The G5 Sahel's completed force will be composed of 5,000 troops and aims to be fully operational by the end of the month.
Investigators are considering whether the attack on the well-protected French embassy was merely a diversion.
He stressed the need to boost worldwide partnership to support efforts by Burkina Faso and the Sahel countries to root out terrorism. The various insurgencies in the region have caused thousands of deaths in addition to making tens of thousands of people flee their homes.