Zane Gordon Robertson, a New Zealand athlete, was detained for five days to allow police to conclude investigations into a case in which he is accused of illegal possession of a firearm.
He is also facing allegations of attempted rape in Iten, Elgeyo Marakwet County.
Police broke into his house on Wednesday morning and recovered an AK-47 and 23 rounds ammunitions.
The prosecution informed the court in Iten that the athlete and Titus Kiprotich were arrested at Mindililwo sub-location in Keiyo North Sub County for the offenses of attempted rape and being in possession of a pistol without a license.
The two appeared before Principal Magistrate Emily Kigen at Iten Law Courts.
Police said they need more time to conclude investigations, noting that the athlete, who is serving a suspension from the Athletics Integrity Unit (AIU) for anti-doping violations, is a flight risk.
The firearm and ammunition will be taken to the National Police Forensic Laboratory for ballistic analysis to establish if it has been used to commit a crime in the country.
