Federal officials confirm that the device found outside the downtown Renton Library on Wednesday was an improvised explosive device or a pipe bomb.

The Bureau of Alcohol, Tobacco, Firearms and Explosives along with the Renton Police Department continue to investigate the incident for any more clues as to who constructed it and why it was left in the bushes, 50 feet from the library along the Cedar River Trail.

The investigation will take some time and it is possible for the ATF to get fingerprints from the exploded device, said Special Agent Brennan Phillips, of the ATF.

If convicted, the suspect faces a 10-year federal sentence.