Who called from 3018614333

This number has been showing up three or four times a day for the past few weeks. The few times I've answered the call, there have been several seconds of silence and then whoever is on the other end of the line hangs up.

As above I also have been getting calls from this number. In my situation I hear nothing on the other end. Just silence. I haven't tried calling back. Anyone else?

I am getting the same thing. I try calling back from another and nothing.

Claims to be nonprofit representing several police agencies.
This is one of several phone numbers they use.
Will call day and night.

This number has been showing up on caller ID three or four times a day for the past two or three weeks. The few times I've answered, there have been several seconds of silence and then whoever is on the other end hangs up.