NEW : The number of injured had dropped from previous reports because there was `` a lot of confusion with people coming into the emergency room . '' Utility company says it appears it struck a gas line . Two people also missing , Kansas City fire department says . Witnesses say roof fell off restaurant . People in the area said they could smell smoke well before explosion .
NEW : Utility company says it appears it struck a gas line . Two people also missing , Kansas City fire department says . Witnesses say roof fell off restaurant . People in the area said they could smell smoke well before explosion .