Ernst Van Dyke held up his trophy at the finish line.

Tatyana McFadden of the US won the women's wheelchair division.

Ernst Van Dyk of South Africa won the men's wheelchair division of the Boston Marathon.

A runner gave a high five at the beginning of the Boston Marathon.

Runners in the first wave of 9,000 crossed the start line.

Runners placed their hands over their hearts during a singing of the National Anthem.

Elite women ran along the course shortly after the start of the women's division.

Elite men made their way along the course.

Athletes from the elite men's field started the 118th Boston Marathon.

Athletes from the elite women's field crossed the start line.

Dick Hoyt pushed his son Rick Hoyt (center) as they competed in the wheelchair division.

Security officers checked bags that spectators brought onto Boylston Street.

Wellesley College student Alix Lewis set up the "scream tunnel" posters.

Sarah Norcott will reveal to her husband, Jim, the sex of their baby when he finishes the race today.

Runners prepared for the race at Boston Common.

Memorials for the Marathon bombing victims are set up at the finish line.