WHAT NEXT? Dallas police placed on high alert after anonymous threat

Dallas police officers and SWAT units combed a parking garage adjacent to the department’s downtown headquarters Saturday after a suspicious person was seen on the garage’s second floor.

Authorities confirmed to Fox News that the person was spotted in an area of the garage reserved for police officers and employees and ran away when confronted. Approximately two hours after the original sighting, a search of the garage turned up no suspicious person or object.

Shortly after the search began, Dallas police confirmed that they had “received an anonymous threat against law enforcement across the city” and had taken “precautionary measures” to heighten security.

The parking garage incident also highlighted the heightened tension among law enforcement officers across America after a week of violence following the deaths of two African-American men at the hands of police.

dallaspol_small WHAT NEXT? Dallas police placed on high alert after anonymous threat

Maj. Thomas Castro told the Associated Press several general threats had been made against Dallas police, though nothing specific.

WFAA reported that one of the threats against police was made by a group from Houston that claimed to be armed.

An armored vehicle was moved to near the department’s downtown headquarters late Saturday afternoon and heavily armed officers carrying rifles were seen walking nearby. Police shut down a street in front of the department’s headquarters, but members of the public were still able to walk about freely around the building. One man dropped to his knees in front of the makeshift memorial and began singing “Amazing Grace.”

Dallas Police Department spokeswoman Sr. Cpl. Monica Cordova called the security measures precautionary.

Police departments around the country have been the subject of violent threats this week after videos showing police shootings of black men in Louisiana and Mississippi.

On Saturday, a suburban Chicago woman was accused of posting a threat on Facebook to shoot any police officer who pulls her over and asks her to get out of the car.

Police in Bossier, La., say a man was jailed after posting a social media video in which he says he wants to shoot and kill a police officer. Investigators say the man made the video while sitting in a car that was behind a police unit at a fast-food drive-thru.

And in Racine, Wis., police say they arrested a man who posted calls for black men to kill white police officers and their families.

Later Saturday, the police department in the Gulf Coast town of Waveland, Miss., said it had received what authorities there deemed credible threats against officers.

Police Chief David Allen told The Sun Herald newspaper the threats had come via phone and social media and involved possible gunfire attacks Saturday night and Sunday. Extra police were to be on duty during the weekend.

Officials in Waveland have also notified surrounding police agencies, fire departments and emergency medical services.