Last week a French-Palestinian reporter confirmed this, when he was brought to the hospital to meet with a Hamas "local council" and be interrogated and threatened. Then, he asked for the article to be unpublished.
So all the reporters know this -- and in fact the reporters have been brought there for friendly chats with Hamas -- but no one will report it.
The idea that one of Hamas' main command bunkers is located beneath Shifa Hospital in Gaza City is one of the worst-kept secrets of the Gaza war. So why aren't reporters in Gaza ferreting it out? The precise location of a large underground bunker equipped with sophisticated communications equipment and housing some part of the leadership of a major terrorist organization beneath a major hospital would seem to qualify as a world-class scoop--the kind that might merit a Pulitzer, or at least a Polk.