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The United Nations has cautioned Iraq against revenge attacks in the wake of two explosions in a predominantly Shi'ite district of Baghdad that killed 73 people.

The UN secretary-general's deputy special representative for Iraq, Gyorgy Busztin, said on September 22 that leaders should "take strong action not to let violence escalate further."

The two blasts on September 21 in Sadr City followed two other explosions outside a Sunni mosque in the city of Samarra in which 18 people were killed.

An increase in sectarian violence in Iraq in recent months has fuelled concerns of an all-out conflict between the country's Shi'ite majority and its Sunni minority.

Based on reporting by AFP