“Six individuals opened fire on the Cappuccino cafe before taking refuge in the Splendid hotel” in Friday’s attack in the capital Ouagadougou, Valls told parliament.
“Three were killed and three are still being sought,” he said.
Burkina Faso had not made public the number of assailants in the attack that left 30 people dead, many of them foreigners.
Authorities in Ouagadougou said the bodies of three assailants had been identified, but several witnesses have said they saw more than three attackers.
Al-Qaeda in the Islamic Maghreb (AQIM) on Monday named three gunmen involved in the assault.
It published photos of the three young gunmen dressed in military fatigues and wielding weapons, identifying them as Battar al-Ansari, Abu Muhammad al-Buqali al-Ansari and Ahmed al-Fulani al-Ansari, AFP reported.
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