Raven 23 was briefed on threat from White Kia

On September 16, 2007, Blackwater security teams were briefed on the threat of three suicide car bombs operating in the area intent on attacking a convoy or a market place. One of the vehicles identified in the brief was a white Kia sedan. 

Source:
US vs Raven 23 
Closing Arguments for the Defense 
Testimony offered on Aug 27, 2014, page 12