DYFED-Powys Police has referred itself to the Independent Office for Police Conduct (IOPC) following a fatal motorbike crash.
22-year-old motorcyclist Callum Hanson, from Haverfordwest, died in hospital following the crash, and a 22-year-old woman who was riding as a passenger on the bike was also taken to hospital.
The 60-year-old driver of the Kia was uninjured.
Dyfed-Powys Police has since referred itself to the IOPC due to the presence of a police vehicle in the vicinity of the incident.
The force said there was “no suggestion” that the police vehicle had been involved in an active pursuit or that there was any contact between it and the motorbike.
“A voluntary referral was made to the Independent Office for Police Conduct (IOPC) in relation to this case, due to the presence of a police vehicle in the vicinity,” a police spokesperson said.
“This was to ensure full transparency and is a standard requirement in order to ensure independent oversight.
“There is no suggestion of an active pursuit or any contact between the motorbike and the police vehicle at the time of the incident.
“Due to this, the IOPC have referred the matter back to Dyfed-Powys Police for an internal investigation by the Professional Standards Department (PSD).
“While PSD carry out their enquiries it would not be appropriate to comment on the matter further.
“The thoughts of Dyfed-Powys Police remain with Callum's family and friends at this time, and we would still ask that anyone with information about the incident contacts the force.”
Following Callum’s death, his family described him as a "kind, loving person who lived life to the fullest".
"Callum’s family wish to remember him as the kind, loving person he was, who lived his life to the fullest, despite his own personal challenges,” they said.
"He was a deeply caring person and spent the last month looking after his grandad, who sadly, also recently passed away.
"Callum has a passion for gaming and motorbikes and was training to be a mechanic in college.
"Callum will be remembered by his mum Joanne, dad Carl, sister Kacey, nan Heather, girlfriend Emily, and his wider family and friends.
"The family now ask for privacy during this difficult time."