Illegal e-bikes: how they are hunted and how they get away

Electric motorbikes, suped up to reach speeds of 50 and even 70mph are causing havoc in communities across the country.

You might have seen them - tearing through towns, their riders often in balaclavas, riding illegally, two abreast.

The police say they want to do more to stop them - so why can't they?

Rhys Williams tells Lucy Watson what you need to know.