The Metropolitan Police have launched an investigation after protesters vandalised the broadcaster's office in London.
Palestine Action issued a statement claiming responsibility for the damage, saying it covered the building in "blood-red paint" and broke windows in protest against what they claim is the BBC's "pro-Israel bias".
A clean-up is under way with footage showing the paint being removed using pressure washers.
A Metropolitan Police spokesperson said officers were called in the early hours on Monday to reports of criminal damage to a building in Portland Place.
"Red paint had been sprayed on the wall of a building and glass doors smashed," the spokesperson said.
"No arrests have been made and inquiries are ongoing."
Monday's protest marks the second time the group claimed responsibility for vandalising the broadcaster's headquarters over its Israel-Hamas coverage, with the first action taking place in October 2023.
"The BBC's biased reporting isn't a simple case of poor journalism - it's a matter of life and death," Palestine Action said, in a statement issued on Monday.
The BBC declined to comment.
