Paul Curran

Some witnesses feel the ground shaking just before the north WTC tower starts collapsing:
Fire Patrolman Paul Curran is in front of the US Customs House (WTC 6), next to the North Tower. He says, “all of a sudden the ground just started shaking. It felt like a train was running under my feet.… The next thing we know, we look up and the tower is collapsing.” [City of New York, 12/18/2001]
EMS Lieutenant Bradley Mann is heading toward the EMS staging area on Vesey Street. He’d felt the ground shaking prior to the first collapse (see Shortly Before 9:59 a.m. September 11, 2001). He says, “The ground shook again, and we heard another terrible noise and the next thing we knew the second tower was coming down.” [City of New York, 11/7/2001]
Jay Jonas is actually inside the North Tower, on its fourth floor. Seconds before the collapse he feels “a tremendous vibration and shaking; the floor began waving.” [Providence Journal, 9/11/2002]