A disappointing thriller with employs the disaster movie formula but never gets much from it. — The Movie Scene

The movie tells us nothing at all about the gunman. But it takes great pains to establish other characters who are in the movie for a dreadfully simple reason: One by one, they will be shot. The clue is in the decision to keep the gunman anonymous. The movie’s totally uninterested in the reasons behind his action; he’s necessary only as an agent of violence, so we can be entertained by his victims. I found that disturbing. — Roger Ebert, 1976.