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Timeline of events in Boston

9:22 a.m.: Wheelchair race starts

9:32 a.m.: Elite women start

10 a.m.: Elite men and Wave 1 start

10:20 a.m.: Wave 2 starts

10:40 a.m.: Wave 3 starts

10:47 a.m.: Hiroyuki Yamamoto (Japan) crosses the finish line in 1:25:32 as the men's wheelchair winner

11:07 a.m.: Tatayana McFadden (from Maryland) crosses the finish line in 1:45:24 as the women's wheelchair winner

11:59 a.m.: Rita Jeptoo (Kenya) crosses the finish line as the women's winner in a time of 2:26:25

12:10 p.m.: Lelisa Desisa (Ethiopia) crosses the finish line as the men's winner in a time of 2:10:22

2:08 p.m.: Red Sox defeat the Rays on Mike Napoli walk-off double. Fenway Park is 2 miles from the finish line

2:50 p.m.: Two explosions go off at the finish line (time according to WBZ Boston)

3:58 p.m.: Boston Globe reports that all off-duty Boston Police Department officers are called in

4:06 p.m.: Boston Police Department issues initial statement saying that 23 were injured and two killed in the explosion

4:20 p.m.: Associated Press reports that, according to an intelligence official, two additional explosive devices were found and were being dismantled

4:50 p.m.: Boston Police Department announces that there was a third explosion at the JFK Library, 5.3 miles from the finish line