"This morning a MINUSMA (UN stabilisation mission in Mali) vehicle ran over a mine" 30 kilometres from Kidal, the statement sent yesterday via Twitter said.
"Five blue helmets were slightly injured," it added, giving no more details.
UN peacekeepers took over security in July last year from the pan-African AFISMA military mission, which had been supporting French troops who entered Mali to push back an Islamist militant advance on the capital.
MINUSMA is made up largely of Africans but China offered in May last year to supply more than 500 troops in what is to be its biggest contribution to UN peacekeeping.
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A unit of Chinese soldiers arrived in Mali last week in the troubled west African nation's rebel-infested north.
The UN mission played a key security role in presidential polls last year which saw former premier Ibrahim Boubacar Keita become the country's first democratically elected leader since a March 2012 military coup.