Two of the leading candidates for Mayor of London have pledged to use their powers to prevent the London arms fair taking place again if they are elected.

Christian students have joined protests at the London arms fair this week, ranging from lobbying MPs to a nonviolent blockade of the arms fair entrance.

The London arms fair has opened to a storm of controversy, with protests outside Parliament, the offices of arms companies and at the gates to the event itself.

UK ministers have invited the governments of Bahrain, Saudi Arabia and Algeria to send delegations to the London arms fair, which starts today.