A United Nations official says one peacekeeper has been killed in a rocket attack on a joint U.N.-French base in northern Mali.

The spokesman for the U.N. mission in Mali, Olivier Salgado, says eight rockets struck in Kidal on Tuesday afternoon, killing one soldier.

He did not mention the soldier's nationality and said the identity of the attackers was not immediately known.

The attack came as the U.N. peacekeeping chief was visiting Mali after the death of nine peacekeepers in a separate assault last week.

The U.N. mission in Mali says 30 peacekeepers have been killed and 90 injured since the mission was established last July to stabilize Mali's north, which fell under the control of Tuareg separatists and then al-Qaida-linked Islamic extremists following a 2012 coup.