AN UNINTENTIONAL ROOF FALL OCCURRED IN THE #45 BLOCK OF 4 LEFT 1 NORTH RETREAT SECTION. THE FALL EXTENDED FROM THE GOB INTO #11 ENTRY OF OLD 3 LEFT 1 NORTH PARTIALLY COVERING TWO MOBILE ROOF SUPPORTS. SIZE OF FALL COULD NOT BE DETERMINED. BUT IT WAS HIGHER THAN THE EXISTING ROOF BOLTS PRODUCTION WAS INTERUPTED FOR APPROX 5 HOURS.