Modern Ghana on 20th June reported that authorities in Nigeria say they will close their border with an unnamed neighbouring country within the next few days to stop foreign rice being smuggled in. “Poisonous materials” and “arsenic” are among the substances a minister claims are present in rice imported from China and SE Asia into Africa. Nigerian authorities have not yet disclosed which neighbouring country the smuggled rice is coming from, local media say the country in question is Benin.
https://www.modernghana.com/news/862188/nigeria-to-shut-border-over-poisonous-rice.html
However, the Independent in Nigeria claimed the neighbour affected was Cameroon, in a report on the seizure by the Navy of a ship smuggling rice – the vessel carrying 2,860 bags of foreign rice.
https://independent.ng/navy-impounds-ship-with-smuggled-rice-in-calabar/