BAMAKO, Mali (AP) — A suicide attack at a U.N. camp in northern Mali killed four peacekeepers on Wednesday, the country’s peacekeeping mission said, raising concerns of worsening security as government officials warn about the possible return of Islamic extremists to the region.

A vehicle exploded at the entrance of the camp in the northern town of Aguelhoc, in the Kidal region, at 3:30 p.m., according to a U.N. statement issued Wednesday evening.

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