(CNN) -- Anti-government protests across Syria -- one propelled by the funeral of an assassinated Kurdish opposition leader -- turned deadly again Saturday as security forces cracked down, activist groups said. Mashaal Tammo, a spokesman for the Kurdish Future Party and a member of the newly formed Syria National Council, was shot dead Friday at a private residence in the northeastern city of Qamishli. The London-based Syrian Observatory for Human Rights said after Tammo's funeral, more than 50,000 people joined a mass demonstration demanding the overthrow of the government of Bashar al-Assad. It said two people were killed. The group said a 14-year-old child was killed in Damascus province and 14 others were injured when security forces opened fire on a funeral procession for protesters killed Friday.
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NEW: Syrians in Turkey gather to remember slain opposition leader
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His killing sparks protests in Syria that turn deadly
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A general strike is called in the city where he was killed Friday
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Syria remains tense as a violent government crackdown continues
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Meanwhile in London Saturday, five protesters were arrested outside the @placeholder Embassy.
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Tammo had previously spent more than three years as a political prisoner for his criticism of the @placeholder government, it added.
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Clashes also broke out Saturday between security forces and protesters who had pulled down a statue of @placeholder, the LCC said.