I just got one from the IRS...

It came from Jamaica. Spoke perfect English...he was good.
Yesterday I got one from some yahoo wanting money for the local policeman's fund...it was a blocked number so I don't know where it was from but heavy foreign accent was a bit of a clue.
There was a warning yesterday on our local news of scammers calling up people and claiming to be the police and a family member was in jail and wants you to send money to bail them out. I haven't got one of those yet. If I do they will probably get a not so nice earful like the guy from the "IRS" just got.
Be extra careful and if you have elderly parents...warn them. They are often too trusting....I know my own mom is.
Grandma Mary might just want to send some money to get grandson out of jail and not know it was a scam and might not realize that the scammer doesn't know the grandson's name.