WICHITA (AP) — A federal magistrate judge says an avionics technician charged with plotting to bomb a commercial aircraft terminal in Kansas poses a public danger and should not be released pending trial.

U.S. Magistrate Judge Karen Humphreys also ruled at Friday’s hearing that Terry Lee Loewen is a flight risk. She entered a plea of not guilty on his behalf.

The 58-year-old man is charged with attempted use of a weapon of mass destruction, attempted use of an explosive device to damage property and attempted material support to al-Qaida.

Loewen was arrested Dec. 13 after a months-long undercover sting. Prosecutors say he tried to bring what he believed was explosives onto the tarmac at Wichita’s Mid-Continent Airport where he worked. They say the attack could have killed or maimed hundreds of people.