According to CNN, hundreds of White Helmet volunteers are stuck in Syria after others were evacuated into Israel.
The group of rescue workers and their families were not able to reach evacuation areas in southern Syria because roads were blocked due to fighting.
Combat operations by Syrian forces have intensified in recent days to eradicate the forces of Khalid ibn al-Walid, the last affiliate of the Islamic State in Syria.
But a member of the White Helmets still in Syria left a series of voicemails with CNN to describe their situation.
According to one of the volunteers, at least 300 rescue workers are still in Syria, after hundreds of others were evacuated into Israel on their way to Jordan.