Three girls and one boy were reported missing at the meet on Sunday.
American Maggie Schmaedick finishes 12th overall in front of her home fans.
Elsewhere, American Sabrina Southerland finishes eighth in her heat.
Americans Brendan Shearn and Jonathan Green finish 15th and 24th.
The 18-year-old was the lone American to advance out of Tuesday’s middle-distance action.
American Sabrina Southerland also advances to Wednesday’s semifinal.
The last time the IAAF held a world championship in the U.S. was 1992.
The 18-year-old American will kick off the meet, held in Eugene, Ore., with Thursday’s 3000m.
He dedicated it to the people of his native Ethiopia.