On 14 April, 230 girls were kidnapped from the Chibok Government Secondary School by the terrorist group Boko Haram in Nigeria. All are still missing, and this Thursday (11 September) marks 150 days since the girls were taken.

Encouraging its members worldwide to 'raise a voice for the voiceless', Girls’ Brigade International (GB) has produced a prayer resource, with help from Open Doors, for use on Thursday.

To generate a significant social media presence it has also organised a Thunderclap for Thursday - Thunderclap is a website that allows people to pledge a social media post. All pledged posts will go out at the same time, on the same day, saying the same thing, in order to achieve the maximum impact. GB is encouraging people to sign up for its Thunderclap via Facebook or Twitter.

Members of the 18-30s GB England & Wales’s advocacy group will also be writing a letter to Prime Minister David Cameron to remind him about the missing girls, and urging him to use his influence in the international community to ensure everything is done to get them home.

Claire Rush, Participation & Advocacy Co-ordinator for GB England & Wales, said, ‘Thursday 11 September marks 150 days since more than 200 Chibok young women, some members of GB, were kidnapped by Boko Haram.

'These young women have been silent for 150 days but we have a voice that can be heard. Let’s raise our voice for the voiceless on 11 September.’