The crew were seized after Hong Kong-flagged crude supertanker, the Nave Constellation, was attacked 77 nautical miles off Bonny Island on December 3.
According to a report by a French NGO, far-right terrorism has increased 320 percent in recent years and 80 percent of terror victims are Muslim.
This is the latest in a long chain of tit-for-tat violence that has plagued Nigeria's northwest.
The move is thought to be in retaliation for Nigeria shutting its borders. The country made the protectionist move to stop cheap imports damaging local markets.
The CFA Franc has always seen as a vestige of colonialism, but now eight West African countries are aiming to decolonise and start their own currency.
The Independent Electoral Commission of Nigeria says over 31,000 police had been deployed, as well as 87 gunboats, to prevent, or deal with, any electoral violence.
In an escalating tit-for-tat trade war, the Ghana Union of Traders Association shut down almost 70 Nigerian-owned businesses because of Nigeria’s closure of its border to imports and exports.
Nigeria launched a crackdown on illegal religious schools and rehabilitation centres in late September. Nearly 1,500 people have been rescued since September.
Artist Yinka Shonibare's programme aims to bring painters, sculptors and other creatives to the West African nation's commercial capital, Lagos.
The remaining crew on the MV Bonita notified local authorities, and the vessel docked at the port city of Cotonou, following the incident.
UN says stopping the work of the aid groups has left nearly 400,000 people 'without food and other essential help for the last month'.
Pakistan, Afghanistan and Nigeria are the only countries in the world, where polio is endemic. And in contrast to recent years of gradual improvement, this year there have been at least 72 cases of polio in Pakistan after only eight in 2018.
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