Sayyidah Zaynab, a suburb of Damascus, has a large Iranian presence.
According to local media, a loud explosion was heard at a location associated with Shiite militias south of Damascus.
Some sources said that the explosion was due to a fire in a factory, Mehr reported.
However, Mehr also noted a conflicting report which claimed that the explosion was due to an assassination attempt on a "prominent figure," and that the results of the operation are not yet clear. WATCH