Reporters Without Borders has reported about journalists that have been attacked by police in New Orleans for documenting abuse:
Quoting Reporters Without Borders:
Reporter Tim Harper and photographer Lucas Oleniuk of the Canadian Toronto Star daily were the victims of police violence while covering a clash between police and looters. The police threatened them several times at gunpoint and, when they realised Oleniuk had photographed them hitting looters, they hurled him to the ground, grabbed his two cameras and removed memory cards containing around 350 pictures. His press card was also torn from him. When he asked for his pictures back, the police insulted him and threatened to hit him.
Peter Fimrite, a reporter for the San Fransisco Chronicle, has also written a first-hand account of being held at gunpoint... apparently just for being outside at night with a cell phone, trying to find signal.