The United Nations' rights office says at least 40 civilians were killed last weekend by al-Qaida-linked rebels trying to take control of a besieged town in Burkina Faso’s hard-hit northern region. The militants in the attack on Sunday also wounded 42 people and set fire to three camps for internally displaced people. The U.N. Human Rights Office said Tuesday in a statement that the attack was a war crime. Approximately half of Burkina Faso is outside government control. The landlocked country has been ravaged by jihadi attacks.