Islamic State killed 400 people in Syria's Palmyra - state TV
It said it was quoting residents inside the city, which is known as Tadmur in Arabic and is home to renowned Roman-era ruins including well-preserved temples, colonnades and a theatre.
Opposition activists have said on social media that hundreds of bodies were in the streets of the city after it was seized by the ultra hardline group on Wednesday. They said they were believed to be government loyalists.
(Reporting by Mariam Karouny; editing by David Clarke)