were a mix of individuals who slipped while in the process of climbing down or had jumped; all three fell within minutes of each other from the south side of the 79th floor shortly after 9:30 a.m., a fact highlighted in the NIST report. Eyewitnesses reported that although most of them jumped alone, some were seen jumping in groups, with one survivor claiming to have seen as many as six people all holding hands as they fell. Despite how grim conditions became directly beneath Flight 11's impact zone, it is not entirely clear if any of the jumpers were from Floor 92, although an employee trapped on that floor named Thomas McGinnes mentioned in a phone call that through the windows he could see people jumping from the floors above his. While McGinnes would not have been able to see what was happening elsewhere on his floor as a result of being trapped in a conference room, this would imply that all of the jumpers were from the 93rd floor up. None of the people who were filmed or photographed falling from the towers have ever been officially identified, including the person whose picture became known as The Falling Man. The collapse of the towers before the jumpers' remains could be removed from the scene made it impossible to identify the jumpers through DNA analysis, with a spokeswoman for the New York Medical Examiner's Office pointing out that their bodies were in far too similar a state to those who were crushed in the collapse to distinguish them. In seeking to determine where conditions were most dire and in particular which floors the fires were at their most intense, NIST analyzed video footage and photographs of people jumping or falling. Although they officially counted 104 people who fell―101 of whom came from the North Tower―they noted in their report that this figure likely understates the true number of those who died in this manner. The sight and sound of these individuals falling from the towers, then "smashing like eggs on the ground" horrified and traumatized many witnesses. The jumpers' death certificates state the cause of death as "blunt trauma" due to homicide. Some of the occupants of each tower above its point of impact made their way upward toward the roof in hope of helicopter rescue, only to find the roof access doors locked. Port Authority officers attempted to unlock