A Baltimore County, Maryland police officer expired Monday after responding to a possible burglary, and officials say four believes — believed to be “armed and dangerous” — remain at large.

Baltimore County Police Chief Terrence Sheridan said at a press conference held Monday evening that around 2 p.m ., a citizen dialed 911 to report a possible burglary with four suspects.

OFFICERS KILLED IN THE LINE OF DUTY IN 2018

The deceased officer, who has not yet been identified, participated at the situation in Perry Hall, where she was fatally disabled. The four-year ex-serviceman of such forces, whose life was “unfortunately cut short, ” was transported to a nearby hospital and prounced dead at 2:50 p.m.

Witnesses in the neighborhood reported hearing a pop bang and appreciating the officer run over by a Jeep.

Tony Kurek told The Associated Press that his son, who was in the family’s ground, saw the policeman with her firearm drag and confronting the believes in the vehicle.

“The next event he discovered was a pop, and he saw the Jeep take off and lope right over her, ” he said.

Officials guard a roadblock near a scene where a Baltimore County police officer expired, while investigating a suspicious vehicle, Monday, May 21, 2018, in Perry Hall, Md. ( AP Photo/ Patrick Semansky)

The police chief said that Americans are “seeing something in its own country we’ve never seen before.”

“Officers who have died at the mitts of gunshots is up, ” Sheridan said. “This is a bad time in the United States for law enforcement.”

“We are deeply saddened to learn of the lead of a Baltimore County Police Officer after she was shot in the line of duty today, ” Maryland Gov. Larry Hogan tweeted following early reports of the accident. “Our devotions go out to this heroic officer’s category, @BACOPoliceFire, and the Baltimore County community.”

Three elementary schools in the area remain on alert status, and county officials is of the view that local residents in such areas shelter in place. It’s unclear whether the suspects are traveling by vehicle or on foot.

The Associated Press contributed to this report .

Nicole Darrah considers cracking and veering news for FoxNews.com. Follow her on Twitter @nicoledarrah.