It seems to have been well reported in Arab news sources, but not so many western ones, but there have been accusations that the US military have been detaining and mistreating non-embedded reporters allegedly making them stand for long periods, denying them water, and even beating one of them. The particular story I have read concerns two Israeli and two Portugese reporters. The Portugese were called Castro and Silva. Stick their names into Google news to find out what they say happened to them.

It certainly makes me suspect that the military are deliberately targetting places where non embedded journalists are staying - not with the intention of causing a huge loss of life or injury (that would provoke too much of an outcry), but to deliberately persuade these people that they are in too much danger to stay.

Peace