BEIRUT - At least 40 people were killed and 90 wounded in a series of explosions in the center of the northern Syrian city of Aleppo on Wednesday, the Syrian Observatory for Human Rights said, citing medical sources.

State television said four blasts ripped through Aleppo's main Saadallah al-Jabiri Square and a fifth struck a few hundred meters away, on the fringes of the Old City where rebels and forces loyal to President Bashar Assad have been fighting.

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