On 003 section, a roof fall occurred in the #3 entry - pillar section. All wings on block were mined, ready for butt-cuts. When MRS's were lowered, fall occurred on top and in front of MRS's. Fall approx 35' x 18' W x 8-10' H. Trapped both MRS's. No injuries. Fall reported to MSHA with ""J"" order issued. Modified to ""K"" order at 23:45 hours. Fall was between spad 2503 & spad 2509.