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Cameras document the destruction of priceless relics and statues in the town's museum.
"I'm devastated," Dr. Amr Al-Azm, a former director of scientific and conservation laboratories at the general department of antiquities and museums in Syria, tells ABC News. "When [ISIS] destroyed those monuments, they destroyed the most important, most iconic buildings in Palmyra and that represents a tragic loss."
Officials are expected to start documenting the losses once bomb squads are finished removing mines and bombs planted by ISIS.
Al-Azm says as tragic as the losses are, the damage could be far worse.
"The initial photos that have now been coming out of Palmyra indicate, or seem to indicate, that the damage to the site as a result of the fighting may not have been as great, so that is good news," says Al-Azm, who is now an associate professor of Middle East history and anthropology at Shawnee State University in Ohio.