Weird wikileaks prosecution threat phone call

I just got a strange automated phone call on my cell phone that said that the ISP linked to my phone number reported that I had viewed wikileak documents and could be prosecuted up to $250,000. Then it asked me to leave a message in my defence and my individual case would be evaluated by what comments I left. Then I heard a beep and I hung up.
Weird... and at 10:30 ish pm.
The call came in from an unknown number that my phone didn't record me receiving on my call history.