Coup Atlas Research Database
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47512221997ConspiracyMilitary coup

Nigeria, 1997 — military coup conspiracy

Nigeria (NGA)West Africa, AfricaDecember 22, 1997

Event Summary

This entry is coded 22 December 1997, corresponding to the December 1997 alleged coup plot against Nigerian military ruler General Sani Abacha, centered on his deputy, Chief of General Staff Lieutenant General Oladipo Diya. On the night of 21 December 1997, Abacha's government arrested Diya, the de facto vice president, along with Major Generals Tajudeen Olanrewaju and Abdulkarim Adisa, several colonels, and civilians, accusing them of plotting to overthrow the regime. By one plotter's later account, the plan was to capture Abacha at a military conference in Enugu on 9 December, force him to resign, and change the government, but Abacha's unexpected return to the presidential villa foiled it; Diya had also narrowly survived a bomb blast at Abuja airport days earlier.

A special military tribunal under General Victor Malu sentenced Diya and five others to death in April 1998. Diya maintained he had been entrapped by Chief of Army Staff Ishaya Bamaiyi and called it a phantom coup, and critics saw a purge of Yoruba officers. After Abacha's death in June 1998, the successor government pardoned and released the accused.

The 22 December 1997 coding matches the announcement of the arrests.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: Abacha jailed his deputy and the alleged plotters; they were freed after his 1998 death
RESEARCHED NAME
Key figures
General Sani Abacha (target)
Lieutenant General Oladipo Diya (deputy head of state, arrested)
Major Generals Tajudeen Olanrewaju and Abdulkarim Adisa

Sources

In December 1997 Abacha's government announced it had thwarted a coup attempt planned by his deputy, Lieutenant General Oladipo Diya, who had recently narrowly escaped an assassination attempt, and also arrested three other generals, five colonels, and three other senior officers, with critics suspecting a cover for a purge.
SOURCE REVIEWED Wikipedia: Military coups in Nigeria open source ↗
The arrest of Diya and 11 others for allegedly planning a coup was the first time an officer of Diya's stature had been accused of plotting to overthrow his boss, and came just over a week after a blast at the presidential wing of Abuja airport as Diya's convoy prepared to depart.
SOURCE REVIEWED Inter Press Service: Nigeria Politics, Yet Another Alleged Coup Plot open source ↗
On 21 December 1997 Abacha constituted a special military tribunal under General Victor Malu to investigate the alleged plot, and the accused, led by Diya, were tried and Diya sentenced to death before being pardoned by Abacha's successor Abdulsalami Abubakar.
SOURCE REVIEWED Wikipedia: Victor Malu Military Tribunal open source ↗
Diya insisted he was innocent and described his arrest as a phantom coup devised by Abacha to eliminate him, and on 3 March 1999 Diya, Olanrewaju, Adisa and others were released after General Abdulsalami Abubakar granted them amnesty.
SOURCE REVIEWED Foundation for Investigative Journalism: How the Most Recent Alleged Coup Plot Played Out in Nigeria open source ↗

Editorial Note

Coded 22 Dec 1997 matches the announcement of the 21 Dec 1997 arrests of Diya and others. Diya called it a phantom coup / entrapment; critics saw a purge of Yoruba officers. Verified as the December 1997 Diya plot. Second Nigeria record in this batch, split by phase from the March 1995 phantom coup.

Cross-Reference

Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.

Identifiers for finding this same event in the other datasets:

Cline Center id
47512221997

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: Abacha jailed his deputy and the alleged plotters; they were freed after his 1998 death.

Baseline coding: Plot discovered and disrupted before execution. Recorded leader fate: remained in office; not physically harmed. The baseline file does not name individual targets; researched names are kept in a separate layer.

Baseline Dataset Citation

Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

CSP

Named in the baseline source document; no article citation was recorded.

New York Times

“Nigeria Arrests General Accused in a Coup Plot,” December 22, 1997

This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →

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