Crosses memorializing the people killed in a recent Florida high school shooting were seen on Sunday hanging from a billboard advertising a local gun show in Kentucky, the Louisville Courier Journal reported.

The white crosses included the names and ages of the 17 people who were killed last month when a gunman opened fire at Marjory Stoneman Douglas High School in Parkland, Fla., according to the news outlet.

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The billboard, located in Louisville, includes a picture of a man holding two guns. The billboard promotes the "National Gun Day Gun Show," which took place at the Kentucky Exposition Center at the end of February.

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A spokeswoman for the company that owns the billboard told the Courier Journal the crosses would be taken down over "the next few hours."

According to the publication, it is not clear who hung the crosses from the billboard.

Gun control has become a central issue since the Florida high school shooting, with students demanding that lawmakers take action to prevent future shootings.

President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE has discussed with lawmakers steps they could take to combat gun violence, and the White House is preparing to announce plans to strengthen school safety later on Sunday.

Students have also planned a "March for Our Lives" later this month in Washington, D.C. to rally against gun violence and call for new gun laws.