LONDON (Agencies) - Two Pakistani weapons companies were expelled from a major London weapons fair after a British lawmaker discovered that cluster munitions were being advertised at their stands, the shows organisers said Saturday. Green Party parliamentarian Caroline Lucas said she discovered brochures promoting the weapons at a pair of Pakistani stands pitched at Londons Defence System and Equipment International exhibition held earlier this week. Britain is a signatory to the international convention on cluster munitions, which prohibits the use, production, stockpiling or transfer of cluster munitions - the name given to weapons such as bombs or shells which pepper large areas with shrapnel or mini-explosives. Human rights advocates say such weapons are inherently indiscriminate and often kill civilians. The exhibitions website makes clear that ads for such weapons are banned from the show, but Lucas said she found brochures for 155 millimeter artillery-fired cluster bombs at the Pakistan Ordnance Factory stand and Pakistans Defence Export Promotion Organization pavilion. Im shocked that the British government seems unable or unwilling to police arms sales happening here on its own soil, she said in a statement, demanding that the arms fair be shut down. The fairs organisers confirmed the discovery, saying the stands were dismantled after Lucas flagged the issue on Thursday. Pakistani officials and a London-based technical attache for the Pakistan Ordnance Factory could not be immediately reached. On its website, the group describes itself as the Pakistan militarys 'largest defence industrial complex, composed of 14 factories and two subsidiaries. The exhibitions website makes clear that ads for such weapons are banned from the show, but Lucas said she found brochures for 155 millimeter (about 6-inch) artillery-fired cluster bombs at the Pakistan Ordnance Factory stand and Pakistans Defense Export Promotion Organization pavilion. Im shocked that the British government seems unable or unwilling to police arms sales happening here on its own soil, she said in a statement, demanding that the arms fair be shut down. The fairs organizers confirmed the discovery, saying the stands were dismantled after Lucas flagged the issue on Thursday. Pakistani officials and a London-based technical attache for the Pakistan Ordnance Factory could not be immediately reached. On its website, the group describes itself as the Pakistani militarys largest defense industrial complex, composed of 14 factories and two subsidiaries.