updated 6/25/2009 9:08:18 PM ET 2009-06-26T01:08:18

Twin brothers from Illinois have been indicted in a 2004 mail bombing that injured the diversity director of an Arizona town.

Dennis and Daniel Mahon are charged with conspiracy to damage buildings and property by means of explosive, according to an indictment unsealed Thursday and filed June 16 in federal court.

The indictment says the brothers intended to "promote racial discord" on behalf of the White Aryan Resistance.

The package detonated in Don Logan's hands on Feb. 26, 2004, in the Human Resources Complex for the city of Scottsdale.

The blast injured Logan's hand and arm. A secretary also was injured, and both spent about a week in the hospital.

Police: Assault weapons found
Authorities arrested the brothers Thursday in their Davis Junction, Ill., home and say they had assault weapons, hundreds of rounds of ammunition and white supremacist material.

Authorities didn't know if the brothers had attorneys. There are no telephone numbers listed for Mahon in Davis Junction.

Dennis Mahon also is charged with malicious damage of a building by means of explosive and distribution of information related to explosives, according to the indictment.

The indictment says the brothers conspired to build and deliver the bomb to the diversity office, taught others how to build a package containing a pipe bomb, and sent training materials on the production and use of explosives, techniques to avoid detection by law enforcement, and methods to commit domestic terrorism.

The indictment says Dennis Mahon participated in the construction of the bomb, disguising it in a cardboard box that was delivered to the diversity office and exploded in Logan's hands.

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