An alleged Mexican drug kingpin was arrested in Nigeria last month as he tried to leave the country, the drug enforcement authority has just revealed.

That arrest resulted in the discovery of a suspected industrial-scale methamphetamine laboratory – the third such find allegedly linked to Mexicans in four months.

When Arturo Carrera Loaiza, 40, was detained at Lagos international airport, officials allegedly found digital images of him wearing what they believed to be a laboratory coat alongside equipment consistent with meth production.

The pictures' location data led officers to a property in Ebonyi state, where they said chemicals and drug-making equipment were found.

Loaiza has denied involvement in methamphetamine production and said he had been invited to Nigeria by a local contact for a restaurant business venture, according to a statement from the National Drug Law Enforcement Agency (NDLEA).

The agency's investigators found a CCTV memory card at the suspected laboratory in Ebonyi with footage from the property showing someone who looked like Loaiza wearing a blue laboratory coat. A Nigerian man was also identified directing people as they removed chemicals and equipment from the site.

NDLEA chairman Gen Mohamed Buba Marwa said further intelligence led officers to an isolated house in a neighbouring community, where they recovered chemicals, dehydrators, condensers, a reaction pot, weighing scales, mixers, drums, gas burners and a sieve containing traces of methamphetamine.

No estimate has yet been given for how much methamphetamine the alleged laboratory was capable of producing.

Investigators have alleged that Loaiza had recruited and brought a fellow Mexican to work at another suspected methamphetamine laboratory hidden in a forest in Oyo state, which was raided in June. Four Nigerians were also arrested after the raid.

A month earlier, NDLEA officers arrested three Mexican nationals and seven Nigerians at what the agency described as an industrial-scale methamphetamine laboratory hidden in a forest in another part of the country.

Marwa said the operations showed international criminal groups were attempting to establish drug-production facilities in Nigeria's forests and rural communities.

"Nigeria will not be allowed to become a haven for transnational drug cartels seeking to relocate their laboratories from other jurisdictions into our forests and rural communities", he said.

The NDLEA said its investigation into the network is ongoing, including into those it believes financed or helped facilitate the operations in Nigeria.

Unlike plant-based drugs, such as cocaine or heroin, which can only be grown and processed in certain places, a synthetic drug like meth can be produced anywhere with the right chemicals and expertise, making it easier for organised crime groups to quickly scale up production.

West Africa poses numerous attractive benefits to Mexican syndicates, starting with swathes of forested land which serves well for secluded production sites.

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