DENVER — The FBI is investigating the possibility that a homemade explosive set off near a Colorado NAACP office was a case of domestic terrorism.

Investigators also are considering many other possible motives and have not determined whether the nation’s oldest civil rights organization was targeted, Denver FBI spokeswoman Amy Sanders said Wednesday.

The blast happened at about 11 a.m. Tuesday outside a barbershop that shares a building with the NAACP’s Colorado Springs chapter, about an hour south of Denver. There were no injuries and only minor damage.

While local chapter members said they were waiting for more information from law enforcement before drawing any conclusions, speculation washed across social media about whether the explosion was a hate crime. Sanders said investigators have not ruled out any possibilities.

“We’re exploring any potential motive, and domestic terrorism is certainly one among many possibilities,” she said.