Groups: Explosion heard near Baath Party office in Syrian city of Aleppo
(CNN) -- A powerful explosion rocked Aleppo, Syria's most populous city, late Friday, killing a guard at an office of President Bashar al-Assad's ruling Baath Party, opposition groups reported.
The cause of the blast was not immediately known. Heavy gunfire was heard in its aftermath, the UK-based Syrian Observatory for Human Rights reported.
Earlier, Syrian authorities foiled a suicide bombing in the city, state media said.
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