Recently, radio bursts from space were observed with a strange mathematical pattern.
The following article claims the chances of the signals having a natural cause are only 1 in 5000.
That doesn't necessarily mean they're extraterrestrial, as the possibility has not yet been ruled out that we're dealing with interference, e.g., from a communication satellite.
The topic is being discussed at The OutPost Forum: http://www.theoutpostforum.com/tof/showthread.php?1974-Signals-from-Space