Declining police involvement and arrests in the wake of protests that began in the summer of 2020 have been linked to a record number of murders in the country’s major cities, according to a recent analysis.

The Law Enforcement Legal Defense Fund, a pro-law enforcement group based in Washington, D.C., examined murder rates in the country’s major cities and found that "tangible de-policing," which began in June 2020 amid anti-police protests and policy decisions, has caused murder numbers to soar.

The Unites States saw more than 20,000 murders last year – approximately 4,000 more than in 2019 and the highest number of murders nationwide since 1995 – as law enforcement "pulled back," according to the report.

"This data confirms that in places where law enforcement saw the most resistance from community leaders and calls for less policing, we saw more homicides," LELDF president Jason Johnson said in a prepared statement provided to Fox News. "Progressive prosecutors made it clear that making arrests for drug and weapons crimes that will go unprosecuted only exposes officers to the risk of disciplinary action, lawsuits and criminal prosecution. So, to mitigate that risk, police took a more passive approach."

MINNESOTA PROTESTER TELLS FOX NEWS REPORTER: ONLY WAY THINGS CHANGE IS 'IF PEOPLE START THROWING THINGS'

Police in some parts of the country have decreased their proactive policing efforts, such as in making traffic stops, searches and arrests, the report states.

In St. Louis, 87 out of every 100,000 residents were murdered in 2020, making the city "America’s Murder Capital," the group found.

And in Portland, murders skyrocketed by 255% in the nine months from June to February, the LELDF said.

POLICE DEFUNDED: MAJOR CITIES FEELING THE LOSS OF POLICE FUNDING AS MURDERS, OTHER CRIMES SOAR

In Chicago, data from June 2020 through February 2021 compared year-over-year shows police arrests declined 53%, while homicides jumped 65%. In New York, June to December data for 2019 and 2020 show police arrests slid 38%, while murders were up by 58%. And Louisville saw an 87% murder spike in 2020 compared to 2019, while traffic stops dipped by 35%, the report states.

According to the report, Minneapolis saw a 64% increase in murders and a 42% decrease in traffic stops; Los Angeles reported a 51% homicide uptick and a 33% slowdown in arrests.

CLICK HERE TO GET THE FOX NEWS APP

"Since June 2020, local leaders and activists’ increasing attacks demoralized, debilitated and, in some cases, defunded law enforcement. As police stepped back, violence surged," the report states.

The group also found that there was a 35% surge in homicides across the largest 60 U.S. cities.

"The hostile work environment for law enforcement makes them risk-averse, reactive, disempowered and discouraged. Increasingly, police are disengaging from the hardest, riskiest but most necessary types of police work," the report states. "Thin Blue Line retreats, violence charges in."