Militants from the Islamic State group have destroyed part of the Roman Theatre in the ancient city of Palmyra in Syria, reports the BBC.
Syria's antiquities chief said the tetrapylon - a group of four pillared structures which were mainly modern replicas - has also been ruined.
The jihadists recaptured the Unesco-listed archaeological site in December from government troops.
The head of the UN cultural body said the destruction was "a new war crime".
Its director general, Irina Bokova, said what she described as "cultural cleansing by violent extremists" had resulted in "an immense loss for the Syrian people and for humanity".
IS destroyed other monuments after it first seized Palmyra in May 2015.
The group held the site and nearby city known locally as Tadmur for 10 months.
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