Saeb Erekat, in the middle of one of his many bizarre anti-Israel interviews filled with lies, mentioned in passing that some 1400 Palestinian Arabs have been killed in Syria since the uprising began.
In an interview on a Dubai TV show Erekat also said that Israel wanted to assassinate Abbas, that Fatah was ready for a new era of responsible and transparent government without corruption, and that Israel killed Yassir Arafat because of his "attachment to Jerusalem and the refugee issue and Palestinian rights."
I think that the statistic of 1400 Palestinian Arabs killed in Syria is pretty accurate, proving the adage that even a broken clock is correct twice a day.