The opposition Syrian National Council (SNC) called Wednesday on Lebanese authorities to investigate the cases of 13 Syrian rights activists who have gone missing in Lebanon over the past few months, dpa reported.
"The SNC executive board has expressed its concern in a letter sent to Prime Minister Najib Mikati in light of reports by rights groups that 13 Syrian nationals have been kidnapped," the council, which groups opponents of Syria's President Bashar al-Assad, said in a statement.
"The Council is very worried that opposition members are being handed over to the Syrian security services and as such risk death," the statement said.
The head of Lebanon's internal security forces, Ashraf Rifi, last month told a Lebanese human rights parliamentary committee that he had evidence pointing to the involvement of the Syrian embassy in the kidnapping of Syrian opposition members from Lebanon.
Some 5,000 Syrians have sought refuge in Lebanon since anti-government protests began in Syria in mid-March.
Among those missing is Shibli al-Ayssami, a leading member of the Syrian opposition. Ayssami was one of the original founders of the Syrian Baath Party and escaped Syria when Hafez al-Assad, Syrian President Bashar al-Assad's father, took power in 1970.