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Advocate photo by John Oubre Governor John Bel Edwards and other officals at the Governor's Office of Homeland Security and Emergency Preparedness have press conference about the Police shooting iin Baton Rouge Sunday July 17, 2016

President Barack Obama has called the families of three Baton Rouge officers who were killed when a gunman opened fire on them in Baton Rouge on Sunday. 

According to White House Press Secretary Josh Earnest, Obama placed calls to the families of Officer Matthew Gerald, Officer Montrell Jackson, and Deputy Sheriff Brad Garafola to offer his and the First Lady's condolences on behalf of the country.

Obama also reached out to to Baton Rouge Police Chief Carl Dabadie Jr. and East Baton Rouge Parish Sheriff Sid Gautreaux to offer his condolences to their departments and restate his support for the ongoing investigation into the deadly shooting.

Obama has ordered that flags will be flown at half-staff across the country through Friday in honor of the slain officers. 

His presidential proclamation issued Monday afternoon applies to flags at the White House and on all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the federal government throughout the United States and its territories and possessions. It also extends to all U.S. embassies, legations, consular offices and other facilities abroad, including all military facilities and naval vessels and stations.

In addition to the three officers who were killed, three more were injured.

On Sunday, Obama addressed the nation, condemning the attack in Baton Rouge. 

"Regardless of motive, the death of these three brave officers underscores the danger that police across the country confront every single day," Obama said. "And we as a nation have to be loud and clear that nothing justifies violence against law enforcement. Attacks on police are an attack on all of us and the rule of law that makes society possible."

Earlier on Monday, Gov. John Bel Edwards had ordered that all United States and Louisiana flags flying over public buildings in the state to fly at half-staff through sunset July 25.

"These courageous men are heroes in the truest sense of the word,” Edwards said in a statement along with his executive order. “It is with a deep sadness that I issue this executive order today, but it is with great respect that we honor their fearlessness and bravery. Rather than running from danger, they ran towards it and three of them paid the ultimate sacrifice. They will never be forgotten. In honor of their lives, let us all remember that what unites us is far greater than what divides us.”

On Sunday, Edwards ordered that the Louisiana Governor's Mansion be lit up blue in honor of the fallen officers.

Follow Elizabeth Crisp on Twitter, @elizabethcrisp.