It's a story that's generated a lot of calls to the police, fire department and to News 3. Residents in the northwest part of the valley say they felt shaking of some sort Monday afternoon.

However, what caused the ground to shake has yet to be determined. Many calls we received were from the Summerlin area and further north.

News 3 contacted Nellis Air Force Base. They said take offs and landing on the base are running normal, but say they too have received calls.

We even checked with an earthquake expert that says nothing has registered in the area. We will continue digging deeper and let you know when we find out more.