18 construction workers were on site of the under construction addition to the Willis-Knighton North Hospital in Shreveport, LA when a second story concrete slab collapsed. 9 workers were injured in the collapse, but it does not appear that any of the injuries are life threatening.  The local Fire Chief, Scott Wolverton, told KSLA local news that the most difficult part of his team’s job was determining whether or not anyone was trapped under the rubble.