Image caption The proposal is to fine anyone caught on a bike without a helmet £50

Northern Ireland Assembly members have voted in favour of a bill to make the wearing of cycle helmets compulsory.

The second stage of the Cyclists (Protective Headgear) Bill was passed by a margin of two votes.

If it eventually becomes law cyclists not wearing a helmet will be liable for a £50 fine.

Cycling organisations have warned it could lead to a dramatic drop in the number of people who cycle.