Friday's attack was the third major assault in Ouagadougou in just over two years.
Its members "expressed their solidarity with Burkina Faso in its fight against terrorism and stressed the need to intensify regional and global efforts to combat terrorism and violent extremism, which may be conducive to terrorism".
Le Drian says in a written statement that Burkina Faso security forces are mobilized against the assailants, with the support of French security forces, to "reduce the threat". President Roch Kabore tweeted that the death toll had risen to eight.
Inhabitants of Ouagadougou are still to recover from shock after militants carried out simultaneous attacks on Friday morning on the military headquarters of Burkina Faso and the French Embassy in Ouagadougou.
Burkina Faso police said in a statement that units had fanned out across the city to increase security and urged people to remain vigilant. Two attackers were captured, according to military source and state television.
The attack at the army headquarters started shortly after the embassy assault and both were under control by 3 p.m., he said. Then I heard the explosion.
Panicked residents fled the city centre on foot or motorbikes as dozens of Burkina Faso soldiers and armoured vehicles took up positions in the area.
One witness, Omar Zombre, told local TV: "We saw four people who were trying to enter the embassy on the east side".
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"The specialized units of the defense and security forces are in action", the force said on its official Facebook page.
A Reuters reporter said gunfire had largely ceased by noon.
"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".
Burkina Faso, a former French colony that gained its independence in 1960, used to be called the Republic of Upper Volta. The landlocked country of around 19 million exports cotton and gold.
People watch as black smoke rises following series of attacks in Burkinabe capital on Friday.
Eight members of the armed forces were killed by the blast and the parallel attack on the French embassy, while 80 were wounded, said Security Minister Clement Sawadogo.
No group has yet claimed responsibility for Friday's attacks but several extremist groups have vowed to step up the bloodshed in response to the recent deployment of the multinational G5 Sahel force.
Five regional countries launched a new taskforce in 2017 to tackle Islamist militants in the zone, to which global donors have committed a half-billion dollars.