Amman, Jordan (CNN) Efforts to evacuate nearly 300 White Helmet members, left stranded in southern Syria after they were unable to reach an evacuation point in the Israeli-occupied Golan Heights on Sunday, have failed thus far, the volunteer rescue group told CNN Monday.

"Syrian regime checkpoints did not allow the majority of us to reach the evacuation point," Abu Mohmmad, a White Helmets volunteer, said. "The situation is getting worse by the minute, especially after the batch of White Helmets who have managed to leave yesterday morning, the regime is looking for us."

That fighting has intensified in recent days as Syria tries to eradicate the last remaining ISIS pockets in the southern part of the country. Israel assisted with the evacuation Sunday of hundreds of the rescue workers and their family members, but the remaining group couldn't make it to the evacuation point due to heavy fighting between ISIS and the Syrian regime, the White Helmets volunteers told CNN.That fighting has intensified in recent days as Syria tries to eradicate the last remaining ISIS pockets in the southern part of the country.

"Our names were on the evacuation list from the beginning. ... We tried by all means, but the roads were not safe," White Helmets member Abu Laith told CNN. "We are currently appealing to the world and don't know our fate. Our situation is very miserable. We are besieged."

Another White Helmets volunteer, Mohammad Abdallah, told CNN he was told to cross to the Golan Heights without their families, "which was something rejected by us because the retribution by the Syrian regime and its allied militias is a bigger (risk to) our families."

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