The FBI sent us mail!

[Brett's Honey]

Since my brother-in-law set up and maintains our racetrack website, he sometimes checks the mail that goes there before we do. He contacted us about an e-mail sent to our track website from "the FBI" stating that our IP address was tracked to 11 illegal websites. The e-mail had an attachment we were supposed to open, with supposedly some questions we were told to to answer.
He said the e-mail included an actual working phone number to some FBI office, but he was convinced it was a virus. That was the middle of last week, haven't talked to him since then...anyone know anything about this? Thanks!