Kai'shay Dobbs, 3, holds a #bringbackourgirls sign as she demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
Kai'shay Dobbs, 3, holds a #bringbackourgirls sign as she demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
A protestor demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
A protestor demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
Karilyn Coates, 10, joins others in a candlelight vigil for the more than 300 girls abducted by Boko Haram in Nigeria, at All Souls Unitarian Church in Colorado Springs, Colorado. Photo: Mark Reis/AP
Karilyn Coates, 10, joins others in a candlelight vigil for the more than 300 girls abducted by Boko Haram in Nigeria, at All Souls Unitarian Church in Colorado Springs, Colorado. Photo: Mark Reis/AP
A protestor demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
A protestor demonstrates against the kidnapping of school girls in Nigeria, outside the Nigerian Embassy in London. Photo: Olivia Harris/Reuters
A demonstrator holds a banner during a protest about the kidnapping of girls in Nigeria, near the Nigerian High Commission in London. File picture: Kirsty Wigglesworth
A demonstrator holds a banner during a protest about the kidnapping of girls in Nigeria, near the Nigerian High Commission in London. File picture: Kirsty Wigglesworth
Women carry placards as they attend a protest demanding the release of abducted secondary school girls in the remote village of Chibok, in Lagos. Photo: Akintunde Akinleye/Reuters
Women carry placards as they attend a protest demanding the release of abducted secondary school girls in the remote village of Chibok, in Lagos. Photo: Akintunde Akinleye/Reuters
Catholic faithful take Holy Communion and pray for the safety of kidnapped Chibok school girls during a morning Mass given in honour of the schoolgirls, in Abuja, Nigeria. Photo: Sunday Alamba/AP
Catholic faithful take Holy Communion and pray for the safety of kidnapped Chibok school girls during a morning Mass given in honour of the schoolgirls, in Abuja, Nigeria. Photo: Sunday Alamba/AP
Catholic faithful attend a morning Mass given in honour of the kidnapped Chibok schoolgirls, in Abuja, Nigeria. Photo: Sunday Alamba/AP
Catholic faithful attend a morning Mass given in honour of the kidnapped Chibok schoolgirls, in Abuja, Nigeria. Photo: Sunday Alamba/AP
A woman, wearing a pin in the colors of the Nigerian flag, holds a carnation while taking part in a prayer vigil for abducted Nigerian schoolgirls outside the Consulate General of Nigeria in New York. Photo: Gaia Squarci/Reuters
A woman, wearing a pin in the colors of the Nigerian flag, holds a carnation while taking part in a prayer vigil for abducted Nigerian schoolgirls outside the Consulate General of Nigeria in New York. Photo: Gaia Squarci/Reuters
A man prays for the release of secondary school girls abducted from the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
A man prays for the release of secondary school girls abducted from the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
Churchgoers pray for the release of secondary school girls abducted from the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
Churchgoers pray for the release of secondary school girls abducted from the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
A woman prays for the release of school girls abducted from in the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
A woman prays for the release of school girls abducted from in the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja. Photo: Joe Penney/Reuters
People shout slogans during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
People shout slogans during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
Churchgoers pray for the release of secondary school girls abducted from in the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja May 11, 2014. Nigeria's army has posted two divisions to hunt for 200 schoolgirls abducted last month by Islamist rebels in an attack condemned globally.     REUTERS/Joe Penney (NIGERIARELIGION UNREST - Tags: CIVIL UNREST CRIME LAW RELIGION)
Churchgoers pray for the release of secondary school girls abducted from in the remote village of Chibok, at an Evangelical Church of West Africa (ECWA) church in Abuja May 11, 2014. Nigeria's army has posted two divisions to hunt for 200 schoolgirls abducted last month by Islamist rebels in an attack condemned globally. REUTERS/Joe Penney (NIGERIARELIGION UNREST - Tags: CIVIL UNREST CRIME LAW RELIGION)
Women shout slogans during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
Women shout slogans during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
A woman shouts slogans, during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
A woman shouts slogans, during a rally calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
Police officers try to block a protester during a rally, calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
Police officers try to block a protester during a rally, calling on the Government to rescue the school girls kidnapped from the Chibok Government secondary school in Abuja. Photo: Sunday Alamba/AP
A woman demands for the release of 200+ girls abducted in the remote village of Chibok, during a protest at Unity Park in Abuja. Photo: Joe Penney/Reuters
A woman demands for the release of 200+ girls abducted in the remote village of Chibok, during a protest at Unity Park in Abuja. Photo: Joe Penney/Reuters
People demand for the release of the girls abducted in the remote village of Chibok, during a protest at Unity Park in Abuja. Photo: Joe Penney
People demand for the release of the girls abducted in the remote village of Chibok, during a protest at Unity Park in Abuja. Photo: Joe Penney
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters
People participate in a "Bring Back Our Girls" campaign demonstration and candlelight vigil, held on Mother's Day in Los Angeles. Photo: Phil McCarten/Reuters

People around the world unite in protest against the girls kidnapped by Boko Haram in Nigeria.