"We can't let terrorism slow us down," he said. "Ever since 9//11, any gathering where you get 10,000 or more people could be a target...But it'll be harder as we're approaching the finish line not to think about it."
Allan Mayhew, an ex-marathoner who's ran several times in the Boston Marathon, says there's a special bond between runners that make them all stick together, through thick and thin. It's been 10 years since Mayhew has been to the Toronto Marathon, but he came this year to support Boston by wearing his full blue-and-yellow outfit, and waving a special Boston Marathon flag at the sidelines to cheer everyone on.
"That's the running community, that's the people, they've got big hearts and they support one another," he said. "When I saw what happened in Boston, and having run it, it really touches your heart because I ran across that finish line three times."
Other than the full marathon, runners also took part in the half marathon, 5 km run and/walk, and a team relay race.