A blast targeted a busload of Iranian pilgrims in a suburb of Damascus today and casualties are reported, Arab satellite television stations said.
The explosion happened in the Sayyida Zainab suburb of the Syrian city and television stations Al-Jazeera and Al-Arabiya reported that an unconfirmed number of people may have been killed and injured.
Iranian state-run Press TV reported that as many as 12 people may have been killed.
There was no way to independently confirm the reports and there were no comments from Syrian officials.
The suburb is popular with Iranian pilgrims and is the location of a shrine dedicated to the granddaughter of the Prophet Muhammad.
Syria's Interior Minister confirmed there had been an explosion in Damascus.
But Said Mohammad Sammour told Lebanon's Al-Manar Hezbollah television station that the cause had not yet been determined.
An Associated Press photographer at the scene saw a damaged bus.
Iranian diplomats said two Iranians and four Syrians were injured in the blast.