Gun, blood found on sidewalk, but where are the victims?

A gun was found in the middle of the street near 16th Street and Union Hills -- neighbors heard shots on Tuesday night.

One neighbor says he got up to look when he heard the sound, but because he didn't see anything, he didn't call the police.

About an hour later, a woman walking her dog found the semi-automatic weapon on the ground, and called the police.

However, there were a few bullet holes found in the size of a home in the neighborhood.

Four miles away, three gunshot victims showed up a Phoenix hospital, but we're still not sure if the two are connected.

While some residents in the neighborhood feel this is just an isolated incident, others are shaken up.

This is a developing story. Stay with FOX 10 News for updates.