WASHINGTON — Bipartisan congressional talks on overhauling policing practices have ended without an agreement, top bargainers from both parties said Wednesday, marking the collapse of an effort that began after killings of unarmed Black people by officers sparked protests across the U.S.

“It was clear that we were not making the progress that we needed to make,” Sen. Cory Booker, D-N.J., told reporters. He cited continued disagreements over Democrats’ efforts to make officers personally liable for abuses, raising professional standards and collecting national data on police agencies’ use of force.

Talks had moved slowly for months, and it had became clear over the summer that the chances for a breakthrough were all but hopeless. Booker said he’d told South Carolina Sen. Tim Scott, the lead Republican negotiator, of his decision earlier Wednesday.

Repeated visits to Washington by victims’ relatives helped keep pressure on the issue. But in the end, Booker said, “I couldn’t get to a point where I can meet with families and tell them that we were going to address the specific issues that were putting your family member in harm’s way.”

Scott said he was “deeply disappointed” that Democrats had walked away from accords reached on several issues, including banning chokeholds, curbing the transfer of military equipment to police and increased funds for mental health programs, which address problems that often lead to encounters with law enforcement officers.

“Crime will continue to increase while safety decreases, and more officers are going to walk away from the force because my negotiating partners walked away from the table,” Scott said in a statement.