Back in the Syrian capital today, they offered grim new details about the extent of the destruction caused by the extremists during their 10-month stay in the ancient town.
The museum was trashed and some of its best-known artifacts and statues were smashed by the militants, who cut off the heads and hands of statues and demolished others before being driven out last month.
He and his colleagues were the first specialists to visit Palmyra after it was taken over by the Syrian army, and spent a week working and assessing the damage.
"We collected everything we could. The fragments were spread around the whole museum among broken glass and furniture ... It is a catastrophe," he said, speaking to the AP in the garden of the National Museum in Damascus.
The sprawling outdoor site, a UNESCO world heritage site, as well as the museum were among Syria's main tourist attractions before the civil war.
Among the best-known statues destroyed was the famous Lion of Allat, a 2000-year-old statue which previously greeted visitors and tourists outside the Palmyra museum. The statue, which used to adorn the temple of Allat, a pre-Islamic goddess in Palmyra, was defaced by IS militants and knocked over by bulldozers.
