An opposition leader in Equatorial Guinea who was arrested and held for three days inside a prison was released late Friday.

Marcial Abaga Barril, the representative of the main opposition party on Equatorial Guinea's national election body, was taken into custody on Nov. 1 allegedly in connection with a murder investigation.

His arrest came as his party was preparing to hold a public event to urge a "no" vote on this month's constitutional referendum, which if passed would all but ensure that the country's leader would be able to rule for at least 14 more years.

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