The Boston Police Department has said at least 2 people have died and 23 have been injured in the explosions. There have been no reports so far of anyone from Arizona being killed or injured in the attacks.
Fifty people were registered from Phoenix, 38 were registered from Tucson, 18 from Gilbert, 16 from Glendale, 15 from Chandler, 12 from Mesa, and 11 registered from Tempe.
A total of 25 people registered from the cities of Flagstaff, Prescott, Goodyear, Oro Valley and Vail, Ariz.
There were 26,839 runners were participating in the 2013 Boston Marathon when the explosions occurred.
The Boston Marathon is the world's oldest, still-running marathon. The first run was held in 1887. Over 26,000 runners competed in last year's marathon, while only 21,000 crossed the finish line. Runners represented 92 countries and 55 U.S. states and territories in last year's event.
To compete in the Boston Marathon, runners have to be at least 18-year-old, however, there is no maximum age. The winner receives $150,000 and an additional $25,000 if a course record is broken.
An estimated 500,000 people, nearly 80 percent of Boston's population, line the race route and cheer on the runners.
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