Kenyan police on Sunday (January 27th) arrested two Kenyan women and two Nigerians for suspected heroin dealing in Nairobi's Kitisuru area, Kenya's The Standard reported.

The four were arrested with four kilograms of heroin, valued at 10 million shillings ($114,000). Initial police investigations suggest that the Nigerians, in Kenya illegally, were supplying the drugs to the Kenyan women who posed as university students to sell the heroin to other students.

The Anti-Narcotics Unit and the Special Crimes Prevention Unit (SCPU) raided the house where the four were staying on a tip that the group had up to 40 kilograms of heroin stored in their house, SCPU head Said Kiprotich said.

"It seems they had sold or supplied out the rest but we are interrogating the suspects to know more on where the rest could be," he said.

The suspects are expected to appear in court on Monday to face charges of drug trafficking.

The incident comes after security officials at Nairobi's Jomo Kenyatta International Airport this week apprehended a 25-year-old Tanzanian woman carrying more than 5.4 kilograms of heroin.

Police believe most of the drugs in circulation in Kenya originate in Tanzania, smuggled into the country via roads and airports.