(CNN) Someone is leaving colorful, encouraging notes in Dayton's popular nightclub district, not far from the memorial that has sprung up for the victims of Sunday's mass shooting.

They are handwritten on Post-it notes that have been stuck to windows and storefronts and many are signed with the message "we rise by lifting others every day".

There are also notes thanking first responders and honoring the nine people who were killed in the attack

Some of the writings say:

"In a world filled with doubts, bring hope"

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