THAMES Valley Police has called in the Independent Police Complaints Commission (IPCC) to look at its handling of two sex attacks.
The same man has been charged over offences in Oxford on March 20 and on May 1 in Watlington, a police force spokesman said.
The force has referred itself to the IPCC and asked it to assess its actions. The spokesman said the IPCC would then decide whether to investigate further.
No details about why the force has called in the IPCC have been released yet.
This is the third time this year it has been reported the IPCC has been asked to look at Thames Valley's responses to serious incidents. In March it emerged the force had referred itself over how it handled part of the investigation of murdered teenager Jayden Parkinson.
And in January it was reported the IPPC was investigating a 999 call from a 22-year-old who was later raped in Botley Road.