It was not possible to verify the images' authenticity.
Palmyra is home to a UNESCO World Heritage site, and Syria's antiquities chief has said the insurgents would destroy its 2000-year-old ruins, including well-preserved Roman temples, colonnades and a theatre, if they took control of them.
Islamic State fighters entered the museum in Palmyra on Saturday and placed guards at its doors, the museum's director said.
Some modern plaster statues in the museum have been destroyed but most of the antiquities in the museum were removed and brought to Damascus before Islamic State cemented its control of Palmyra. There are also fears for other, larger monuments that cannot be moved.
Islamic State destroyed ancient monuments and antiquities they see as idolatrous in areas of Iraq they captured last year.
Supporters have also posted videos they say show the group's fighters going room to room in government buildings in Palmyra searching for government troops and pulling down pictures of Syrian President Bashar al-Assad and his father.
Some activists have said more than 200 Syrian soldiers died in the battle for the city.
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