More than 10,000 runners will be out on city streets Sunday morning to take part in the annual Scotiabank Calgary Marathon.

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Scotiabank Calgary Marathon executive director Kirsten Fleming said she expects this year's event to top last year's total of 11,200 runners. (CBC)

Participants have a choice of running 5K, 10K, a half marathon or the full 42.2-kilometre marathon, starting and finishing at Stampede Park.

Executive director Kirsten Fleming, who was in Boston when its race was targeted by terrorists, said the tragedy there prompted a review of security measures for Calgary’s race.

"Safety’s paramount when you’re organizing any event, and we take that very seriously," she said.

"We already have a massive emergency response plan that’s in place, that’s very comprehensive. We definitely sat down and refined that, but it will be business as usual."

Calgary’s marathon is the oldest in the country, Fleming said.

"I’m excited, I just look forward to seeing what we can become. Because this started as a small, grassroots — 19 guys that ran up and down Macleod Trail back in 1963," she said.

Runners have until 5 p.m. on Saturday to sign up.

By the time registration closes, organizers expect to have more runners than last year’s total of 11,200.