What kind of owl might this be?

A bird flew through my work today and my coworkers suggested it was an owl. I've searched pictures online, but it's no owl I can find. The bird was small enough to be scooped up in someones hands, but its wingspan was about two feet. Its beak was hooked like a predator and was all black. The feathers were speckled dark brown and black. Unfortunately, I didn't get a look at its tail or feet. D: Any ideas? It looks very similar to a western burrowing owl, but darker and with a black beak, if it helps.