More than 100 peacekeepers have died in recent months, making it the most deadly U.N. mission to date.
The U.N. camp came under heavy mortar fire on Thursday, injuring five. Shortly afterwards, three U.N. soldiers were killed in an attack just outside the camp, the U.N. said, giving no further details.
The nationalities of the soldiers and the identity of the attackers were not yet known.
Despite ongoing French strikes on their hideouts, fighters, including local al Qaeda affiliates, have staged a series of attacks this year, including a suicide bombing at an army base in January which killed at least 77 people.
Several French soldiers were wounded last week in an al Qaeda mortar attack in Timbuktu.
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