Denver police were looking for a person who shot at a campaign office for President Barack Obama on Friday, NBC station KUSA reported.
Police say there were people inside the office at the time of the 3 p.m. shooting, but no one was hit.
A single bullet struck the office and broke the window, Detective Raquel Lopez, Denver police spokesperson, told NBC News. But detectives could not confirm that the shot was fired with the intent to hit the office.
Detectives were still investigating the intent of the shot. They were looking into the possibility the shot was fired from a vehicle.
Read more at 9news.com, KUSA's website
Police were reviewing surveillance video for possible leads, KUSA reported. Investigators said they have a "vehicle of interest" and are interviewing witnesses.
A campaign official confirmed the incident but referred questions to the Denver police.
More content from NBCNews.com:
- Rep. Jesse Jackson Jr. under federal investigation over alleged financial improprieties
- Gay teen denied Eagle Scout: 'Change is happening' over Boy Scouts anti-gay policy
- Jerry Sandusky letter to judge: 'Goliath won, and I must deal with the outcome'
- Chicago public schools chief out in wake of teachers strike
- Video: Aggressive Biden on the attack in Ryan debate
- Two toddlers critically injured in attack by aunt's Rottweilers
