BOSTON (CBS) – Boston paused to mark the sixth anniversary of the Boston Marathon bombings as One Boston Day fell on Marathon Monday for the first time.

One Boston Day was created to honor the countless lives impacted by the deadly 2013 bombings that claimed the lives of Martin Richard, Lingzi Lu, Krystle Campbell and Sean Collier.

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Martin Richard, Lingzi Lu, Krystle Campbell, Sean Collier and Dennis Simmonds. (WBZ-TV)

Boston Police officer Dennis Simmonds suffered a head injury during a shootout with the Tsarnaev brothers and died almost a year later.

Runners, family members, and spectators say when it comes to that terrible day six years ago, they will never forget, but they will not let it define the race.

“It was such a tragedy and glad that there’s so much support of people coming out for the marathon still in light of what happened, the tragedy that happened that year,” one woman said.

At 2:49 p.m., the bells of Old South Church rung out to mark the moment when the first bomb exploded on Boylston Street in 2013. An announcement was made near the finish line.

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Seconds after the bells stopped, rain started to come down hard and the crowd erupted in a large cheer.

“I don’t think it brings us down, I think it brings us up even more,” said Carol Andersen from Quincy. “Nothing brings Boston down. It’s a tough city and I’m proud to be part of it.”

People were encouraged to pledge and share acts of kindness using the hashtag #OneBostonDay.