A grand jury has indicted the man accused of plotting a suicide bomb attack at a Kansas airport where he worked as an avionics technician.

A three-count indictment returned Wednesday charges Terry Lee Loewen with attempted use of a weapon of mass destruction. The 58-year-old Wichita man also is charged with attempted use of an explosive device and attempted material support for terrorism.

His defense attorney declined comment Wednesday.

The charges are essentially the same as those brought in a criminal complaint Friday when Loewen was first arrested. FBI investigators say Loewen was trying to take what he believed was a car bomb onto the tarmac at Wichita’s Mid-Continent Airport when they arrested him.

The indictment makes a public preliminary hearing unnecessary.

A detention hearing is scheduled for Friday.