The most concrete evidence of this incident is clear video, not eyewitness testimony. It was obtained about a year ago from the dead when the grave was unearthed.
> A video, discovered on the cellphone of a paramedic who was found along with 14 other aid workers in a mass grave in Gaza in late March, shows that the ambulances and fire truck that they were traveling in were clearly marked and had their emergency signal lights on when Israeli troops hit them with a barrage of gunfire.