Thousands protest in London, demand UK rethink Brexit

LONDON (CBS) - Thousands of people gathered in the center of London on Saturday to demand a second Brexit referendum so that Britons can rethink whether they want to leave the European Union.

The Put it to the People protest is set to be one of the largest protest gatherings in recent years, as efforts to halt the Brexit process pick up steam.

Aerial pictures from a helicopter showed the scale of the demonstration as crowds marched through London landmarks such as Marble Arch, Park Lane and Downing Street.

Demonstrators flew large EU flags as the march slowly made its way towards Parliament Square.