"He indicated his anger and his malice, I would say, to TSA (Transportation Security Administration) officers," said Bowdich.
Ciancia, a 23-year-old white male, remained hospitalised Saturday with four gunshot wounds, including one on his head, and the FBI was unable to speak to him.
Four of the injured - two TSA emloyees and two civilians - were shot by Ciancia with an assault rifle.
The other two were injured in the ensuing panic.