Reporter : ` ` The worst scene I ' ve ever seen , '' FBI agent testifies . Agent recounts the ` ` chaotic '' scene of the mass killings at Fort Hood . Army psychiatrist Maj . Nidal Hasan is charged with killing 13 people , wounding 32 . Hasan has denied he was the gunman ; he 's representing himself .
NEW : `` The worst scene I 've ever seen , '' FBI agent testifies . Agent recounts the `` chaotic '' scene of the 2009 killings at Fort Hood . Army psychiatrist Maj. Nidal Hasan is charged with killing 13 people , wounding 32 . Hasan has admitted he was the gunman ; he 's representing himself .