The African country of Kenya presided upon by Uhuru Kenyatta has handed over four men suspected of trying to smuggle large quantities of heroin to the United States (US), police said yesterday.

According to Ceoafrica, Kenyan brothers, Baktash and Ibrahim Akasha, were arrested in the coastal city of Mombasa in November 2014, along with Indian national Vijaygiri Goswami and Pakistani citizen Gulam Hussein, following a sting by the US Drug Enforcement Administration.

The four have not yet commented on the allegations. They are expected to appear in a federal court in Manhattan later on Tuesday.

US officials allege the Akasha brothers were a crucial link in a supply chain that connects Afghanistan's poppy fields with consumers in Europe and the US.

According to a US indictment, Ibrahim Akasha personally delivered 99 kilos of heroin and two kilos of methamphetamine to undercover agents.

US officials allege the Akasha brothers are continuing the business of their late father, also named Ibrahim, who was described in a secret 2006 US diplomatic cable published by WikiLeaks as a "drug baron".

He was killed in Amsterdam after being shot four times by a bicycle-riding assassin in May 2000.