Authorities are looking for a man who may have information about an explosion set off near the Colorado Springs chapter of the NAACP.

The Tuesday blast outside a barbershop next door to the group's building caused no injuries, police said. There was only minor damage to the site which is which is about an hour south of Denver.

FBI spokeswoman Amy Sanders says an explosive was detonated against the building, but it's too soon to know whether it was aimed at the nation's oldest civil rights organization.

Sanders says a gasoline canister had been placed next to the improvised explosive device but it did not ignite.

She says investigators are looking for a balding white man in his 40s who may be driving a dirty pickup truck.

A woman who answered the phone at the NAACP office but declined to give her name said people inside the building heard a "loud boom" coming from a lawn area in the rear.

Wire services