Key facts
- An explosion was heard in Damascus on Thursday.
- The cause of the blast was not immediately clear.
- Syrian state TV reported the incident.
- Authorities were working to determine the source of the blast.
An explosion was heard in the Syrian capital Damascus on Thursday, with the cause not immediately clear, according to Syrian state TV. The state news agency SANA stated that authorities were working to determine the source of the blast. An AFP news agency correspondent observed ambulances with sirens sounding heading towards the area following the report.