The NCB yesterday apprehended Emmanuel Chukwuemeka Alasoro, a Nigerian put up in South Mumbai, his compatriot Onyebuchi Christian Nzeakor and Laurindo Ramos Armando, a Mozambique national, the official said.
Ketamine is a type of drug a doctor might give to put someone to sleep for an operation and as it has also hallucinogenic effects,it is abused by teens and young adults at bars and nightclubs.
The trio were arrested from a suite of a starred hotel on January 11 and are currently in judicial custody.
On the arrest of three Africans, NCB said they have adopted a unique modus operandi to smuggle out the contraband apparently to evade detection.
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"It is very unique modus operandi as they (trio) used to impregnate the towels with Ketamine and send them to their probable customers", the official informed.
"We will interrogate the trio to find out how did they source out drugs from India and till now how many times they have sent the contrabands abroad", said an official.