Update: Search ends at Dallas Police Department - KWWL - Eastern Iowa Breaking News, Weather, Closings

Update: Search ends at Dallas Police Department

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(CNN) -

Dallas Police experienced heightened security Saturday night after an anonymous threat came in to the police department.

Police officers searched headquarters and grounds for a person of interest, but nobody was located.

According the department's Twitter page the search has concluded and no suspicious items or people were found.

People and reporters in the area were directed to stand back from the property until the search was done.


The Dallas police headquarters is heightened security, CNN's Martin Savage reported Saturday evening.

Department public information officer Monica Cordova said police are tightening security throughout the city because of "an anonymous threat."

Dallas detectives on Saturday were piecing together a picture of Micah Xavier Johnson to determine whether he acted alone in his ambush of police or had allies in preparing for the shooting that took five lives at a protest.

Authorities have said they believe Johnson was the sole gunman during the Black Lives Matter protest Thursday in Dallas.

What is unclear is whether the 25-year-old army veteran, whom some people described as a loner, conspired with others or how long he had planned an attack.

Five police officers were killed and seven others wounded in the ambush.

Two civilians were also hurt, the Dallas mayor's office said.

The shootings came amid a protest over the fatal police shootings of two black men in Louisiana and Minnesota this week. Similar protests -- mostly peaceful -- were held Friday in dozens of cities across the United States, and more are planned for Saturday.

President Barack Obama said Saturday the reaction of the majority of Americans, protesters and police to the week's trio of tragedies showed a nation remarkably unified despite some views it is polarized on racial issues.

Americans of all stripes were outraged a "deranged" individual killed the five officers in Dallas just as American have deep concerns about police shootings in Louisiana and Minnesota, said the President, speaking in Warsaw, Poland, where he was attending a NATO conference.

"There is sorrow, there is anger and there is confusion about next steps but there is unity in that this is not how we want our communities to operate, this is not who we want to be as Americans," Obama said

For the President, that was grounds for optimism that the nation would move forward in a constructive way. He noted the scenes around the country were not akin to the polarized 1960s.

"You're not seeing riots and you're not seeing police going after people who are protesting peacefully," the President said.

"As tough, as hard, as depressing as the loss of life was this week, we have a foundation to build on. We just have to have confidence that we can build on the better angels of our nature."

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