How Law Enforcement All Over the Country Responded to the Dallas Ambush

— -- Law enforcement agencies across the country are responding to the Dallas ambush that left five officers dead and seven more injured.

The most prominent measure major police departments are taking is requiring officers to work in pairs. This includes the Boston Police Department, the Chicago Police Department, the New York Police Department and the United States Park Police.

"In light of the tragic events across the country this week, including the unspeakable police assassinations in Dallas, CPD has designated that all officers must be paired up with their partners to increase visibility and strengthen officer safety," the CPD wrote in a press release.

The CPD also reminded its officers of the importance "to continue promoting positive engagement between officers and the residents we're sworn to protect."

The NYPD advised its officer to "remain vigilant at all times while in uniform" and to be especially alert when members of the public approach them, according to a memo obtained by ABC News. Whether on or off duty, members of the NYPD "are to always be aware of any suspicious behavior and to be alert of their surroundings."

The NYPD also increased security all precincts late Thursday night following the news of the ambush. There will be a substantial police presence at all protests in the city, Mayor Bill de Blasio said in a press conference Friday. There are no credible threats directed toward the NYPD, he added.

De Blasio asked New Yorkers to offer thanks and condolences to officers as they pass them on the street in the wake of the Dallas ambush.

One year later: Dallas officers killed by sniper

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On July 7, 2016, a sniper gunned down a group of police officers in downtown Dallas during a peaceful demonstration against police killings. The attack left 5 officers dead, and 9 others injured. People rally in Dallas, July 7, 2016, to protest the deaths of Alton Sterling and Philando Castile.

Laura Buckman/AFP/Getty Images

Officers with the United States Park Police, which functions as a unit of the National Park Service, will also be "working together" amid increased vigilance, it announced.

The Baltimore Police Department issued a memo stating that it was "shocked and saddened" by the events in Dallas and that it would continue to protect protesters in the city. A Black Lives Matter protest is scheduled Friday afternoon in Baltimore. It is unclear if the BPD has instituted additional safety measures for officers in response to Dallas.

Several more major police departments across the country took to Twitter to express their condolences for law enforcement in Dallas.

Los Angeles Police Department

Houston Police Department

San Francisco Police Department

Orlando Police Department

San Diego Police Department

Indianapolis Metropolitan Police Department

Las Vegas Metropolitan Police Department

ABC News' Geneva Sands contributed to this report.