A group of heavily-armed men are being sought by Belgian police after pulling off a diamond heist.  The exact value of the diamonds is uncertain, but authorities believe it was an estimated at 50-million dollars.  An earlier estimate placed their value at nearly half-a-billion dollars.

Belgian authorities say four masked men grabbed the diamonds as the gems were being loaded onto a plane yesterday evening in Brussels.  Prosecutors say the robbers broke through a fence that surrounds the airport, and drove up to the plane as it sat on the tarmac.