After running more than 26 miles, the Boston Marathon finish line was just ahead for Minnesota marathoner Pat Sauter. Then a "huge boom" shook the earth and brought him and a stream of other runners to a standstill.
Seconds later, a second explosion about 50 yards in front of him shook him out of a state of confusion. "Everyone went into a panic."
People were screaming. Children were crying. Bloodied, injured spectators lay on the ground. "One person was missing a limb," Sauter said.
Cops and race security officials screamed directions. A rescue worker carried a small boy who was bleeding from the head.
"A guy came toward me, his clothes burned or torn off," Sauter said. "He had soot all over. It was just chaotic."
The blasts, which erupted about 100 yards apart in the streets near the finish line, killed three people and injured more than 140 others during what is the Holy Grail of marathons and an attraction that draws about 500,000 spectators. About 500 Minnesotans lined up at the marathon's start along with 23,000 other runners.
"I don't know what a bomb sounds like," said Sauter, a 63-year-old Minneapolis attorney who has run more 60 marathons and was just about to finish his third in Boston. When the first explosion shook the street, Sauter figured organizers had set off a boom "to make the finish" special. Or, maybe it was a construction mishap, he thought.
"A guy in front of me hit the ground," Sauter said. "I wasn't smart enough to do that. I wasn't thinking very well." But within seconds, the second explosion and the plume of smoke rising from two areas along the side of the runners' finishing chute made it clear that something was very wrong.