At the time of explosions near the Boston Marathon finish line, about half of the race's competitors still had not finished.

In the wake of explosions at the finish line of the Boston Marathon, it appears that over 10,000 runners had yet to finish and remained on the course.

Last year, the average finishing time of the 21,554 runners to complete the marathon was 4:18:27. The clock at the finish line when the bomb went off showed about 4:10:00, and CNN said that half of the 25,000 runners had not completed the race yet this year.