A march of social justice in the U.S. has been cancelled as it may put the country's police officers in danger, the organizers say.

Dubbed “Keep the Promise,” the march was part of an event set to be held on the eve of the Republican National Convention in Cleveland, Ohio, but the organizers announced Saturday that they were concerned for safety of officers dispatched to keep order at the event.

The march was supposed to be led by Reverend Al Sharpton, a prominent American civil rights activist.

Organized by the AIDS Healthcare Foundation, the event meant to call on Republicans to “articulate clear domestic and global policies on HIV/AIDS, income inequality and other critical social-justice issues.”

The cancellation was announced after five police officers were killed in Dallas, Texas, by an African American.

"In the current uncertain environment nationwide, we are concerned for police officers who would be charged with protecting our marchers and advocates as well as for the safety and wellbeing of our march participants," Michael Weinstein, the president of the foundation, said in a statement. "In an abundance of caution, we have therefore decided to remain on campus and not march."

Instead, a concert will be held Cleveland State University, according to the statement.

"We feel strongly that remaining on campus at The Wolstein Center at Cleveland State University allows us to share our 'Keep the Promise' message loudly and clearly without increased risk for police and all participants in the event."

Several high-profile police killings of African Americans have sparked nationwide protests in the United States over the past two years.