Emergency services have cordoned off the area surrounding Big Ben after a man scaled one of the buildings in the Palace of Westminster.
Video on social media shows a barefoot man stood on a ledge holding a Palestinian flag several metres up Elizabeth Tower, which houses the Westminster clock and its world-famous bell.
At least nine emergency service vehicles lined Bridge Street in central London and crowds looked on from beyond a police cordon.
Columbia university is relevant to the conflict, because the US actually have a big stake in providing military aid to Israel.
We have no power over what happens there.