TIMELINE: Cleveland School Shooting

Oct. 11, 2007 — -- Below is an outline of the chain of events that occurred as 14-year-old student Asa H. Coon opened fire at SuccessTech High School in Cleveland. Coon shot two students and two teachers before killing himself.

1:10 p.m. EDT: The 911 call came in to Cleveland police

1:13 p.m. The first officers arrived at the school. Using an active shooter protocol, the officers immediately entered and sought to engage the suspect.

Police said the gunman was dead of an apparent self-inflicted gunshot wound when they found his body on the fourth floor of the school. They found two handguns (a .22-caliber and a .38-caliber), a box of ammunition and three knives on or near the suspect's body.

The first police to arrive at the scene entered the school through the front door, which is how the gunman is believed to have entered. The school appears to have had a security guard on duty on the first floor, but it would have been unlikely for the guard to have spotted a concealed weapon. A security guard in the past had also been assigned to the third floor where at least some of the shootings occurred, but that position was eliminated.

The first officers were followed rapidly by the Cleveland Police Department and Sheriff's Department SWAT teams, and even as public officials — the school superintendent and the mayor — arrived and were allowed with their security details to enter the perimeter set up around the school, police continued to treat the scene as if there was a second shooter.

They stayed on their guard until the searches of each floor of the school were completed and they were satisfied there was no second gunman. The school had a strong emergency plan, which public officials praised during briefings.

No sooner had the sound of the first shot echoed through the halls that a code went out over the school pubic address system and teachers began to lock down their classrooms, protecting many of the school's 240 students inside. They were evacuated to a staging area once police were sure it was safe for them to move through the corridors.

3 p.m. Police escorted groups of students from the staging area, diagonally across the street to the FBI field office. There, the federal agents had turned a briefing area over to city officials, and parents were invited inside, where they were met by city officials who shared the information at their disposal with the parents. Some parents opted to stand outside until their loved ones were in sight, and declined the offer to enter the school.