"One man climbed to the top of the building to plant a Palestinian flag and there were at least three arrests.
"Protesters said they were also angry about the BBC's coverage of Israel.
"Police officers formed a human chain across the BBC's Oxford Road entrance and surrounded the building with police vehicles and officers.
"Protesters from the Palestinian Solidarity Campaign, who organised the demonstration, chanted slogans including: 'BBC tell the truth'.
In London, around 5,000 people joined a protest in Downing Street that turned into a march on the Israeli embassy - though the event was predictably underplayed in the corporate media.
In Bristol, protesters got underneath a delivery lorry having already removed Israeli produce from Tesco and occupying the first storey of M&S.
There were also protests in many other parts of the UK including Sheffield, Birmingham, Falmouth, Brighton, Oxford, Cambridge, Nottingham, Edinburgh, Glasgow, Dundee, Aberdeen, Moffat, Inverness and Banff.
Around the world there were countless demonstrations in, for instance, Scandinavia, France, Turkey, Iraq, Lebanon, Iran, Pakistan and the Zionist state itself.