Suspected Boko Haram militants attack a public secondary school for girls in the north-eastern Nigerian town of Dapchi in Yobe state.
Nigerian government confirms 110 girls missing.
Yobe state government announces rescue of some of the girls from "terrorists who abducted them" and says they are with the army.
The Yobe state government retracts the statement and apologises for misleading the public, saying: "No girl was rescued".
President Muhammadu Buhari calls the abduction of the schoolgirls in Dapchi a "national disaster".
Nigerian Air Force announces deployment of military aircraft and additional personnel for search and rescue mission.
Nigerian army denies claims by Yobe State Governor that soldiers were removed from Dapchi before the girls' abduction. The army then admits it redeployed soldiers away from the town, saying the area was "relatively secure".
Federal government launches investigation into the circumstances leading to abduction and releases full details of the 110 missing schoolgirls.
UN Secretary General Antonio Guterres says he "strongly condemns the abduction and attack".
Local human rights activist Aisha Wakil, known as "Mama Boko Haram" because she has known some of the militants since they were children, is quoted in reports saying that the Barnawi faction of Boko Haram confirmed to her that it was holding the girls.
Women hold a protest in the capital Abuja, three weeks after the girls' abduction.
President Muhammadu Buhari announces plan to negotiate the girls' release, rather than use military force.
President Buhari makes his first visit to Dapchi, assuring parents of the missing schoolgirls that the government will secure the girls' rescue.
Amnesty International claims Nigerian army ignored repeated warnings of an attack on Dapchi town, hours before militants abducted the girls.
Nigerian government announces that 104 of the 110 abducted schoolgirls have been freed.