Plan a massive attack.. A student killed 6 children at a Nashville school

US police said a former student killed three children and three adults at a Christian elementary school in Nashville on Monday.

Police explained that the gunman was armed with two weapons and a pistol after carefully planning the massacre by drawing a detailed map and conducting surveillance of the building. 

Attack the number of places

Nashville Police Chief John Drake told “NBC” News that the shooter planned to attack several different places, saying the statement for the suspect "indicates that there was a shooting in multiple locations, and the school was one of them."

Drake said investigators believed the shooting stemmed from "some resentment" the suspect had "because he had to go to that school" as a younger person.

shooting in Nashville

The Covenant school shooting in Nashville was the latest in a series of mass shootings in a country increasingly alarmed by the bloodshed in schools.

Officers shot and killed the attacker at Covenant Presbyterian Church's Covenant School in the Tennessee state capital.

Nashville police have identified the victims, all of whom were nine years old.

Heartbreaking

US President Joe Biden lamented the "heartbreaking" attack, and reiterated his call for Congress to pass meaningful gun control reform including a ban on assault weapons.

Gun violence

"We must do more to stop the gun violence tearing apart our communities," the president said at the White House. "It rips the soul out of this nation."

Drake said, "I was literally moved to tears to see this and the kids being removed from the building."

Police later released security footage of the shooter shooting at a glass school door before moving through the hallways and carrying a rifle. Hill wore a black jacket over a white T-shirt, camouflage pants, and a red backwards baseball cap.