TOKYO (Kyodo) -- Prosecutors on Wednesday dropped their case against former Kenyan marathon runner and two-time Olympic medalist Eric Wainaina, who had been accused of assaulting a woman and a station worker in the capital in March.

The Tokyo District Public Prosecutors Office did not provide a reason for dropping the charges against Wainaina. The 50-year-old former athlete won a bronze medal in Atlanta in 1996 and silver in Sydney in 2000.

Tokyo police referred the case to prosecutors in May, alleging that Wainaina slapped a woman and a male staff member at Komazawa-daigaku Station in the capital's Setagaya Ward.

The police said that Wainaina had told them he believed the allegations to be true but that he was drunk at the time and could not remember.

The incident occurred after Wainaina and the woman argued over smartphone use on a train. They got off at the station, where the staff member intervened.