PHOTOS: Thousands run through heart of San Francisco for Bay to Breakers

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Sunday, May 17, 2015
A runner does a victory handstand after crossing the finish line of San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
ABC7 News reporter Katie Utehs caught these fun snowglobe costumes at San Francisco's annual Bay to Breakers Race on May 17, 2015.
At the mile 3 marker for San Francisco's annual Bay to Breakers on May 17, 2015, the race turned into a party.
Two hours into San Francisco's annual Bay to Breakers Race on May 17, 2015 and runners were still streaming across the finish line.
Isaac Mukandi MWangi of Kenya won San Francisco's annual Bay to Breakers Race on May 17, 2015 with a time of 35:25.
Jane Kibii won the female division of San Francisco's annual Bay to Breakers Race on May 17, 2015 with a time of 40:04.
Isaac Mukandi MWangi of Kenya poses with a gorilla after winning San Francisco's annual Bay to Breakers Race on May 17, 2015 with a time of 35:25.
Isaac Mukandi MWangi of Kenya poses with a gorilla after winning San Francisco's annual Bay to Breakers Race on May 17, 2015 with a time of 35:25.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Runners dressed as jellyfish participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Runners dressed as unicorns participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Police check for alcohol at San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners line up to participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
ABC7 News reporter Katie Utehs gets ready for San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
Thousands of runners participate in San Francisco's annual Bay to Breakers Race on May 17, 2015.
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A runner does a victory handstand after crossing the finish line of San Francisco's annual Bay to Breakers Race on May 17, 2015.
Photo submitted to KGO-TV by Pearl W./Twitter

SAN FRANCISCO (KGO) -- Thousands of runners streamed through the heart of San Francisco for one of the most iconic races in the world -- Bay to Breakers. Originally called the Cross City Race, it's a tradition more than a century old.

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