LAGOS, Nigeria (AP) — Nigeria has been rocked by two mass abductions from schools in the past week, with over 300 children taken by armed gangs in the conflict-battered north.

A tally by The Associated Press shows at least 1,799 students have been seized in a dozen of the largest abductions since the 2014 Chibok attack in which Boko Haram militants seized 276 schoolgirls, sparking global outrage. Most of the children have been released, many after ransoms were paid. Others have escaped.

Here is a timeline of major abductions of students in Nigeria:

April 14, 2014

Members of the Islamic militant group Boko Haram take 276 female students in a nighttime attack at a government secondary school in Chibok in Borno State. More than 90 of the students are still reportedly missing.

Feb. 19, 20

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