LONDON (AP) — A man was arrested early Sunday after he climbed the Big Ben tower at the Palace of Westminster in central London while barefoot and holding a Palestinian flag.

The man, who appeared to be staging a protest on a ledge several meters (yards) up Elizabeth Tower, which houses Big Ben, stepped off the building after midnight and onto a cherry picker following a long conversation with negotiators. He got into a waiting ambulance.

Traffic around the Palace of Westminster in London had come to a standstill for much of Saturday as emergency crews tried to reach the man. Negotiators were lifted up on a fire brigade ladder platform several times before eventually talking him down.

Westminster Bridge and a nearby street were closed for much of the day and several emergency services vehicles were at the scene as crowds looked on. Police also blocked off all pedestrian access to Parliament Square. A small group of supporters shouted “Free Palestine” from behind a police cordon nearby.

Officials said tours of the Houses of Parliament were canceled because of the incident.

The Metropolitan Police confirmed that the man has now been arrested.

“This has been a protracted incident due to the specifics of where the man was located and the need to ensure the safety of our officers, the individual and the wider public,” it said in a statement.