Lagos - Here is a timeline of events since more than 200 schoolgirls were kidnapped in northeastern Nigeria on April 14 by the Islamist group Boko Haram.
A total of 276 girls were kidnapped, attracting worldwide condemnation and prompting an international rescue effort. Of that number, 219 are nonetheless still held captive after others managed to escape.
The army has been criticised for failing to quell the Islamist insurgency, which has killed more than 10,000 people since 2009.
- 14: 276 young girls, aged from 12 to 17, are seized in Chibok, a remote corner of Borno state in northeastern Nigeria.
Boko Haram gunmen storm the girls' boarding school, forcing them from their dormitories onto trucks and driving them into the bush. Fifty-seven girls manage to flee.
- 29: Parents lash out at the government's failure to rescue the girls.
- 1: Hundreds of parents, many dressed in red, protest in Chibok to demand help from the government and other countries.
- 5: Boko Haram's leader Abubakar Shekau says in a video that his group carried out the mass abduction and vows to sell the girls as slave brides.
- 7: US First Lady Michelle Obama tweets a picture of herself with a sign reading #BringBackOurGirls, joining the social media campaign that has also attracted politicians, actors and other prominent public figures like Pakistani eduction activist Malala Yousafzai and CNN star anchor Christiane Amanpour.
- 9: Amnesty International claims that Nigeria's military was warned of the school attack but failed to take action due to lack of manpower. The military denies the allegation.
The UN Security Council strongly condemns the mass kidnappings which it says "may amount to crimes against humanity" under international law.
- 10: British, French and US experts cooperate in the search operation. China and Israel also offer assistance.
- 12: Boko Haram releases a new video showing the missing girls, alleging that the teenagers have converted to Islam and will not be released until militant prisoners are freed.
- 14: The US army says it is using surveillance drones and aircraft to help the search operation.
- 16: President Goodluck Jonathan cancels a scheduled visit to Chibok, prompting fresh criticism from families affected by the attack.
- 17: Meeting in Paris, Nigeria and its neighbours Benin, Chad, Cameroon and Niger vow to work together to fight Boko Haram in what Cameroon President Paul Biya describes as a declaration of war.
-- JUNE --
- 7: At least 20 young mothers are abducted from a nomadic settlement near Chibok by suspected members of the group, according to local residents.
- 12: Representatives from Nigeria, Chad, Cameroon, Niger and Benin agree in London to strengthen joint efforts to find the schoolgirls and defeat Boko Haram.
- 24: Local officials say at least 30 people were killed and 68 women and girls abducted in several fresh attacks. On July 4 however, 63 of them manage to escape.
-- JULY --
- 15: Jonathan offers to meet the relatives of the hostages for the first time since the mass abduction, after being urged to do so by Pakistani education activist Malala Yousafzai.
The families reject the president's invite, demanding that he meet with all the parents, not a select few.
- 18: Borno state Governor Kashim Shettima says that 176 teachers have been killed and 900 schools destroyed in Borno since Boko Haram began attacking them in 2011, because they are centres of Western education
- 22: First meeting between the president and the schoolgirls' relatives.