Swiss police are investigating an alleged robbery amid reports that four-time Formula 1 world champion Alain Prost was injured during a home invasion. Swiss tabloid Blick reported late Friday that the 71-year-old Prost sustained a head injury from intruders who forced his son to open a safe during the incident Tuesday morning.

"The perpetrators entered the residence while the occupants were present, threatened them, and forced one family member to open a safe before fleeing with the stolen goods," the public prosecutor's office said in a statement. "Despite the extensive search operation launched, the perpetrators have not yet been apprehended at this stage."