Palmyra Arch of Triumph 'blown up' by Islamic State

Islamic State militants in northern Syria have blown up another monument in the ancient city of Palmyra, officials and local sources say.

The Arch of Triumph was "pulverised" by the militants who control the city, a Palmyra activist told AFP news agency.

It is thought to have been built about 2,000 years ago.

Frank Gardner reports.