According to a police statement, law enforcement personnel across the city could be under threat. The statement added that police was taking “precautionary measures to heighten security.”
The city's police has deployed SWAT units around the police station in the city, the Dallas Morning News reported.
The incident comes just days after officers came under fire in downtown Dallas. On Thursday, Micah Johnson, a 25-year-old former US Army reservist, shot and killed five officers in Dallas during a protest against police-involved shootings of two African-American men in Louisiana and Minnesota earlier in the week.
The latest threat also comes amid warnings by domestic terror groups via social media of a planned "police purge" that calls for mass killings of cops across the country. Dallas is a curious place for the recent wave of violence against police officers being led by an African-American police chief who lost his own son to the hands of cops during a shootout years ago.
Local news reporter Shaun Rabb of Fox4 reports that two female DPD employees saw a masked man with goggles and a gas mask in the parking garage behind the Dallas Police Department headquarters.
Eyewitness accounts confirm that officers are sweeping a large parking garage outside its headquarters.
Jason Wheeler (@jasonwheelertv) July 10, 2016
Before starting the sweep of the garage, officers pushed back reporters and camera operators who had gathered outside the headquarters in the Texas city's downtown after initial reports of the lockdown. Dallas Police Twitter account has made several comments pleading with media to stay away from the area for the safety of the officers and to stop streaming live coverage around the Dallas Police Headquarters for fear that it will tip off the active suspect.
There have also been bomb threats throughout the city of Dallas.
Dallas Police Depart (@DallasPD) July 10, 2016
Dallas Police report after searching the parking lot behind the department's headquarters that the threat the search has been concluded and the threat has been resolved.
Chief David O. Brown (@DPDChief) July 10, 2016