In what appears to be an attack on a well-known civil rights organization, an “improvised explosive device” detonated on Tuesday at the headquarters of the Colorado Springs, Colorado NAACP, according to a statement by the FBI. No one was killed or injured in the explosion, and there was “only minimal surface charring to the exterior wall of the building,” which also includes a hair salon. The explosion could have been much worse, however, as the explosive device was placed next to a gasoline can in an apparent attempt to increase the force of the explosion. The gasoline did not ignite.

The FBI statement adds that a “potential person of interest in this investigation is a Caucasian male, approximately 40 years of age, and balding. He may be driving a 2000 or older model dirty, white pick-up truck with paneling, a dark colored bed liner, open tailgate, and a missing or covered license plate.”

Read more at ThinkProgress.org.