Following the attacks in Paris, police ramped up security for the Rock 'n' Roll Marathon this weekend along the Las Vegas Strip.
The Las Vegas Metropolitan Police Department did not specify how many more officers they will have.
Race officials said there is no credible threat related to the Paris attacks but ever since the Boston Marathon bombing in 2013, security has tightened up everywhere.
"The Boston Marathon is kind of when the marathon running world changed," said Dan Cruz, spokesman for Rock 'n' Roll Marathon. "Runners have a little bit more presence at events like this. If you see something, say something. Something doesn't look right, something looks suspicious."
There are more than 45,000 people registered for the race, which began at 4:30 p.m.
The marathon and 1/2 marathon on Sunday and a 10K race earlier in the day closed the Strip on Sunday afternoon and evening. Several other streets and freeway ramps were also affected.