In total, according to the latest information, around 37 people were killed (36 Burundian and one member of the armed forces) and between 117 and 134 people were injured.
The clashes broke out when refugees were opposed to repatriation to Burundi, Kasereka said.
He also stressed that defence and security forces could resort to force "only as a last resort" and in accordance with worldwide norms, and urged "the authorities to promptly open criminal investigations".
Burundi's foreign minister, Alain-Aime Nyamitwe, on Twitter described the incident as a "shooting" and said "explanations are needed".
EPL hampers clubs' chances in Europe: Jose Mourinho
Romelu Lukaku has started the season like a steam train and United could easily have waved Zlatan goodbye. The Portuguese gaffer has also mentioned that Marouane Fellaini is a very important member of the squad.
Congolese government spokesman Lambert Mende said the government was investigating what had happened and the identity of the "supposed refugees", saying they had opened fire on soldiers first and "we do not yet understand" how.
Witnesses told AFP that numerous Burundians in Kamanyola were victims of religious persecution because they are followers of a female prophet called Zebiya, who has attested to seeing visions of the Virgin Mary in northern Burundi.
Burundi's foreign minister, Alain Aime Nyamitwe, on Twitter asked Congo and United Nations officials for an explanation of the shootings. Congolese soldiers responded with gunfire when some refugees hurled stones, said refugee Aline Nduwarugira.
More than 400,000 refugees from Burundi have fled to neighboring Congo since 2015, to escape an outbreak of political violence that was sparked by President Pierre Nkurunziza's successful but disputed bid to win a third term in office.