USB 3.0 Broadcasts on ... wait ... 2.4GHz?!

Did you ever wondered why when plugging in some USB 3.0 devices, such as an USB 3.0 external hard disk or an USB 3.0 memory stick, your wireless keyboard and mouse almost cease to work? Keystrokes, mouse movements and mouse button presses get lost nearly all time? Or does your WiFi connection breaks down then?