Who called from 6468937408

Just got the exact same voicemail.
See this ...
https://www.fbi.gov/contact-us/field-offices/ ... ame-to-threaten

I received an automated voicemail from someone claiming to be Catherine Richardson from the FBI saying there was a warrant for my arrest and I should call 973-709-8632. I tried to call and no one answered.

Why would you want to call back an obvious scammer?  If the FBI had a warrant for your arrest, they would have shown up and put pretty silver bracelets on you, not called you to warn you.

I have now received 3 calls from 3 different phone numbers with the same recorded message.

Same exact same happened to me in May. Katherine Richardson and definitely a robot voice leaving the message.