Obama said Friday, July 8 that the Dallas police officers, who were on duty during a protest in response to the fatal shootings this week of two black men by law enforcement in Louisiana and Minnesota, were intentionally targeted.
Obama ordered flags flown at half-staff in honor of the victims and he spoke by phone to Dallas Mayor Mike Rawlings, Dallas Police Chief David Brown and Attorney General Loretta Lynch.
"We will learn more, undoubtedly, about their twisted motivations", Obama said of the shooters.
The rampage in Texas, which erupted Thursday night during a peaceful protest against police brutality, comes at a time of intense soul-searching over the use of lethal force by law enforcement towards African-Americans.
Obama earlier on Friday called the shootings a "vicious, despicable and calculated" attack. Grave violence against law enforcement.
The president said he could not comment on the specific facts of the two shootings because both are under investigation. We are grieving with them. A visibly frustrated Obama urged Americans to push for local law enforcement reforms and said all Americans, regardless of race, should care about the treatment of blacks and Hispanics by police.
Brown's rally comes days after two Black men, Philando Castile and Alton Sterling, were killed at the hands of police, in separate incidents at opposite ends of the country, and it comes one day after five police officers were killed in Dallas while overseeing a protest.
"We also know that when people are armed with powerful weapons, unfortunately it makes attacks like these more deadly and more tragic".
Speaking at a press conference after signing the agreement as the sidelines of a NATO summit in Warsaw, NATO Secretary General Jens Stoltenberg said the deal with "give a new substance and new impetus to the partnership between NATO and the European Union".
Standing alongside European Council President Donald Tusk and European Commission President Jean-Claude Juncker, Obama says governments must move more quickly to deliver economic priorities to their people.
The union has pushed unsuccessfully for federal legislation to make killing someone because they are a police officer a hate crime.
"I'm not a member of that community but if I were I would believe with all of my heart that most of the killings are the type of nearly assassination like killings", from a Mooresville caller.
Obama did not provide details on where the USA troops comprising the North Atlantic Treaty Organisation battalion would come from, or where they would be stationed.
"Later in the week, at the White House, the President will continue the work to bring people together to support our police officers and communities, and find common ground by discussing policy ideas for addressing the persistent racial disparities in our criminal justice system", Earnest said.
The United States is also building a missile defence system in Europe, which North Atlantic Treaty Organisation was due to take control of as early as Friday, the USA defense official said. "As a nation let's keep in mind to express our profound gratitude to our men and women in blue, not just today, but everyday".