Security tight in South Korea's Seoul for G20 summit

The South Korean capital, Seoul, is preparing to host the G20 summit with an unprecedented show of strength from the police, who are deploying 50,00 officers, more than a third of the national force.

With the military also on a heightened state of alert, the authorities say they are ready for both internal and external threats.

The BBC's John Sudworth reports from Seoul.

BBC News