"Ambush," reads Friday's front page of The Dallas Morning News, after rooftop snipers reportedly shot 11 police officers during an otherwise peacefull protest against recent police killings of African-Americans in other U.S. cities.

By early Friday, five of the officers shot were reported to have died, with one civilian also wounded in the shooting clearly aimed at police. The gunfire broke out Thursday around 8:45 p.m. near the El Centro College Garage during a rally protesting recent police shootings in Baton Rouge, Louisiana and St. Paul, Minnesota earlier this week.

Though the story is still developing, at least two snipers are thought to have fired from elevated positions in an "ambush-style" attack, according to Dallas Police Chief David Brown quote by The Dallas Morning News.

A third suspect reportedly declared to authorities that there were bombs planted around the building, and the police believe that these three suspects triangulated their positions in order to injure and kill as many law enforcement officers as possible. There are also reports that one suspect has died from a self-inflicted gunshot.

Public transportation has been suspended in Dallas, and Texas Governor Greg Abbott has canceled his out of state trip to go to Dallas instead.

The attack is the deadliest for U.S. enforcement since the Sep. 11, 2001 terror attacks, according to the National Law Enforcement Officers Memorial Fund.