A second video has been released showing British journalist John Cantlie, who is being held hostage by Islamic State (IS) militants.

It comes less than a week after his first appearance on screen following his kidnapping in Syria in 2012.

Dressed in orange, Mr Cantlie says he has been abandoned by the UK.

IS has recently killed three hostages and, in a video showing the death of UK aid worker David Haines, threatened to kill British man Alan Henning next.

An experienced journalist and photographer, this is Mr Cantlie's second time being held captive in Syria. Having been kidnapped in July 2012 and handcuffed and blindfolded for a week, he escaped with the help from the Free Syrian Army.

He returned to Syria towards the end of 2012 and it was during this trip that his second kidnap occurred.

This latest clip has been circulated as the US and its allies launch air strikes against IS in Syria. UK forces are not involved but the government says it has not ruled itself out.

The video, which lasts for almost six minutes, follows a similar pattern to the first video featuring the journalist.

It is introduced with the title Lend Me Your Ears and Messages From The British Detainee John Cantlie.

He says Western governments "were caught napping by the sheer speed of the Islamic State's growth" and although action is being taken now, they have underestimated "the strength and fighting zeal of the opponent".

"Not since Vietnam have we witnessed such a potential mess in the making," he says.

BBC/NS