Islamic State group fighters have re-entered Palmyra, nine months after losing the ancient Syrian desert city, activists say.
IS held Palmyra and its nearby ruins for 10 months before it was recaptured by Syrian government forces in March.
But the jihadist group launched an offensive earlier this week.
Meanwhile, Russian-backed Syrian government forces are closing in on the remaining rebel-held area of the city of Aleppo.
Civilians are said to be streaming out of the city in large numbers.