Norfolk Police are asking for motorists who might have seen a fatal crash on the A47 at Hockering to come forward
A 19-year-old woman and a 48-year-old woman - both from Dereham - died after their Ford Ka was in Collision with a Mercedes CLK at 4pm on Saturday.
The driver of the Mercedes was unhurt.
Officers are particularly keen to speak to passengers on a double decker bus heading from Norwich to Dereham, who may have seen the incident. The bus was not involved in any way.