Tulsa police are erring on the side of caution following the Boston Bombing.

Officers amped up security for the Color Run at Veterans Park today.

There was music, running, dancing and plenty of color to go around.

But even through the fun, there was a somber undertone that seemed to be on everyone's mind.

"I thought about it and I thought, well yeah, that's scary," Logan Rice said. "It's like, what if that happened right now."

The Tulsa Bomb Squad was also thinking about Boston Marathon Bombing.

Police and K9 officers were out first thing this morning looking for anything out of the ordinary that could be used as a weapon against the crowd.

"We did bring out and extra number of officers in light of what happened this week in Boston, so we do have a higher number of officers here and at the other event," TPD Sgt. Jacob Thompson said.

It's been a difficult week for everyone in the country, including those in Tulsa. But folks at the Color Run said they were ready to end the week on a happy note.

"It's the Color Run, it's the happy run," Gage Williams said. "You've just got to be happy today and just run."

The Color Run, according to founders, is a unique paint race that celebrates healthiness, happiness, individuality and giving back to the community. It's an untimed race, where participants are doused from head to toe in different colors at each kilometer. The fun continues at the finish line with a gigantic "Color Festival."

And Tulsa's run was a happy run with signs of support on the course.

There were runners wearing red socks in support of Boston, special ribbons and a message of hope.

"Being here, you feel like there's not a lot that you can do, but for this it's just our small way of showing them we're supporting them and thinking about them," Heather Williams said.

And for runners, Ivey Baker, seeing that support brought a sense of strength that helped wipe her fears away.

"I don't want everyone in the world to think that all races are going to be that way," she said. "They can still be safe and fun."

Tommy Neugent agrees and said no act of evil is going scare him from enjoying life.

"If we don't come out and do things like this, then we're gonna let them win," Neugent said.

There was a big crowd at the Color Run, police estimated between 18,000-20,000 people, but they reported no problems.