Brothers indicted in bombing of diversity office

updated 9:08 p.m. ET June 25, 2009

PHOENIX - 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.

More from msnbc.com Easing job losses point to wobbly recovery Cars are approaching ‘auto’ pilot mode Were you paying attention? Take our news quiz  Facebook’s fantasy games cost more than time How readers got pieces of Berlin Wall | Gallery  Not supposed to worry about troops at home On Twitter: Breaking news updates | Weird and wild

MORE FROM CRIME & COURTS

Crime & courts Section Front

Alleged shooter tied to mosque of 9/11 hijackers Fort Hood rampage brings prayers, questions Suspect identified in Seattle police killing Alleged Fort Hood shooter's lonely life Killings unsolved as sniper execution nears High court to look at life in prison for juveniles Prosecutors seek journalism students’ grades Onlookers flock to site of Cleveland killings Clear warning signs, Hasan's colleagues say NYT: Muslims at Fort Hood voice outrage Crime & courts Section Front   Add Crime & courts headlines to your news reader: