AMMAN, May 20 (Reuters) - At least 21 protesters were killed on Friday after Syrian security forces opened fire during pro-democracy protests, the Syrian Observatory for Human Rights said.
"The killings have to stop. Independent investigators must be allowed in the country," Observatory director Rami Abdelrahman told Reuters, saying most of the killings occurred in the central city of Homs and in the town of Maaret al-Numan to the northwest. (Reporting by Khaled Yacoub Oweis; Editing by Andrew Heavens)
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