FIREFIGHTERS have issued a warning to be wary of faulty Christmas lights over the festive season.

A dramatic video showing the effects faulty lights can have on a dry tree has been released by firefighters.

The video shows how a broken light can spark an inferno on a Christmas tree that could spread to the whole room in less than a minute.

In seconds, the video shows a living room enveloped with fire.

The London Fire Brigade warned: "Check your Christmas tree lights are in good condition and turn them off before you go to bed.

"Make sure you have working smoke alarms."