Humanitarian access in Syria has improved since the UN Security Council last month authorized the delivery of emergency aid across the Syrian border without the government's consent, UN Secretary-General Ban Ki-moon said in a new report.

But he warned that designated terrorist groups continue to prevent aid workers from accessing some of the estimated 10.8 million people in Syria in urgent need of humanitarian assistance.

"All parties to the conflict continue to deny access to humanitarian assistance in an unjustifiable manner," Ban said. "Hundreds of thousands of people live under siege."

The United Nations Security Council unanimously adopted resolution 2165 last month, which authorized aid access at four border crossings from Turkey, Iraq and Jordan, even though Syria had warned it deemed such deliveries incursions into its territory.

Ban said it was the first time he was able to report improvements since he began submitting monthly updates on aid access earlier this year.

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