ST. LOUIS Bob Sanders was having a bad day.
His bad knee was bothering him, and his fifth Boston Marathon had gone slower than the 53-year-old from Maryville, Ill., would have liked. He started in the third corral of the marathon's second wave of runners, and finished the 26.2 miles in 4:18:41.
"I got my medal, and the foil they wrap you up in," Sanders said by phone Monday afternoon. "I was walking to go get my bag."
But two explosions stopped him in his tracks. Cannons, he assumed. After all, it was Patriots' Day in Boston.
"I turned around, and there was a group of policemen there," Sanders said. "They said, 'That doesn't look good.' And then it was just total chaos after that."
The Boston cops ran toward the apparent attack that would quickly become national news. Sirens grew louder, and Sanders searched for his friend, fellow marathon runner Mike Frigerio of St. Louis.
"I was waiting for Bob," Frigerio...