Davis plays a tape of the 911 telephone calls made while the attack was happening

A teacher in the library talks with 911 as shots are fired in the background. AIFF or WAV (349 K/30 sec. audio) RELATED AUDIO Police dispatcher talks to officers rushing to scene Windows Media 28K 80K Teacher tells students to stay down as gunshots ring out in the background Real 28K 80K Windows Media 28K 80K A student outside the school describes what she saw Real 28K 80K Windows Media 28K 80K RELATED VIDEO: Injured student Makai Hall talks about his experience (April 23) Real 28K 80K Windows Media 28K 80K CNN's Anne McDermott reports on the memorials and investigations (April 23) Real 28K 80K Windows Media 28K 80K Media from around the world converge on Colorado, along with CNN's Anne McDermott (April 23) Real 28K 80K Windows Media 28K 80K To view the latest video streams on the Littleton school shooting, use the arrow buttons below to scroll through the video gallery.        Windows Media Real        28 K 80 K INTERACTIVE: See more scenes from the shooting Audio and Images Interactive Map: Recent school shootings in the U.S. Special: Are schools safe?  ALSO: Fatalities at Columbine High List of injured from Colorado school attack The aftermath Detailed map of Columbine High School Harris hinted at violence to come  MESSAGE BOARD: Colorado school shooting

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Are schools safe?

Weapons found during the investigation: One 9 mm semi-automatic pistol One 9 mm semi-automatic rifle Two sawed-off 12-gauge shotguns More than 30 homemade explosives, some with shrapnel

Address for letters, cards for Columbine High School

Messages for Columbine Communications Services Jefferson County Public Schools P.O. Box 4001 Golden, CO 80401-0001

April 23, 1999
Web posted at: 10:02 p.m. EDT (0202 GMT)

In this story: Video could be 'crucial' Following trail of guns Federal financial help RELATED STORIES, SITES

LITTLETON, Colorado (CNN) -- Screams and gunfire can be heard along with the voices of terrified callers on 911 tapes of the Columbine High School shooting that authorities released Friday.

One teacher called the emergency number while huddled under a table in the library, the center of the slaughter.

Speaking rapidly, almost hysterically, the teacher told the 911 operator she was wounded in the shoulder.

"He turned the gun straight at us and shot and my God, the window went out and the kid standing there with me, I think he got hit," the teacher said.

"Oh God, oh God! Kids, just stay down ... He's upstairs. He's right outside of here," the teacher screamed. "There's someone coming into this room. I'm on the floor. My God, smoke is coming into the room."

The teacher, identified only as "Peggy" by the Jefferson County sheriff department, can be heard screaming for the students to stay down and keep their heads under the tables. Then the dispatcher asked the teacher if she could lock the doors.

"I don't think I'm going out there," she responded. "I've got three children. I'm not going to the door."

Before the teacher called, an emergency operator talked to a female student who reported smoke, students running out of the school and a girl lying in the parking lot, apparently shot.

"OK, can you see anything going on over there?" asked the dispatcher.

"Someone, some girl's over there ... I think she's paralyzed and I think she's hurt. I'm not sure," said the nervous student.

Video could be 'crucial'

Investigators combing the scene of the nation's deadliest school attack now believe there was "certainly indirect involvement" by others -- "if not direct involvement," the lead police investigator told CNN Friday.

About 150 federal, state and local authorities met for a massive debriefing aimed at centralizing the volumes of interviews and evidence collected -- and they are now placing a renewed interest in eyewitness claims that other suspects were involved.

"The information collected today indicates that, if not direct involvement, there is certainly indirect involvement -- perhaps limited participation, knowledge -- on the part of additional individuals associated with this group, the Trenchcoat Mafia," said Let. John Kiekbusch of the Jefferson County Sheriff's office.

Eric Harris, 18, and Dylan Klebold, 17, who police say are responsible for the shootings, were reportedly members of a group called the Trenchcoat Mafia.

Asked if he was feeling more strongly that the two dead suspects "may have had help," Kiekbusch said, "That's correct."

He added: "From listening to radio traffic, from listening to witnesses, that's always been a very real possibility and we're certainly not discounting it now."

Earlier, investigators studied security video from inside Columbine High School where 15 people were killed, including two suspects. The school uses time-lapse cameras, which periodically take pictures instead of running continuously. Each tape goes back about a week.

The security videos were en route to Washington for further analysis by the FBI.

Authorities were especially interested in an after-prom party held Saturday night at the school that could have allowed explosives to be sneaked in.

The videos, Kiekbusch said, "will be thoroughly analyzed as soon as we can to see if we can identify movement in the school by the suspects or anything else that relates to the killings."

Following trail of guns

Another key area of the investigation involves the history of the guns used in the assault: two sawed-off shotguns, a 9 mm carbine rifle and a TEC DC-9 semiautomatic pistol, a modified version of the now-banned TEC-9 assault weapon.

The rifle and handgun have been traced to their original owner but Jefferson County Sheriff's Department spokesman Steve Davis said Friday there was no link between the original owner and the high school gunmen.

"We don't know how many times those guns changed hands before getting to our suspects," he said.

Investigators were still trying to trace the shotguns.

The short-muzzle carbine military-style rifle was the same type of gun used by two Jonesboro, Arkansas, students in another school massacre last year.

Students running to safety during the attack

Lawrence Bettendorf, an agent with the Bureau of Alcohol, Tobacco and Firearms, said it will be difficult to trace the weapons.

"These weapons were originally purchased in the late 1960s or early 1970s, and there is no indication they belong to the parents," he said.

The boys packed the large pockets in their utility pants with extra ammunition and used pipe bombs stuffed with nails and BBs as shrapnel.

District Attorney Dave Thomas said most of the 30 explosive devices found in the school were made from readily available household items.

Authorities continued to search Columbine for more hidden explosives.

Bettendorf said investigators are still trying to figure out how a large propane tank bomb was placed in the school's kitchen. "That's the question everybody is asking," he said. Authorities found it Thursday as they swept the school.

The device, with nails and other shrapnel attached, was removed without incident.

Federal financial help

President Clinton announced $1.5 million in federal money would go toward helping victims of the school shooting and their families pay for funerals, medical expenses, lost wages and counseling.

The money is an initial payment to help the students, teachers and parents in Littleton on "their long journey toward recovery. And we will do more," the president said.

"The images from Colorado have become painfully familiar: the terrified children, the racing ambulances, the grieving families," Clinton said outside the White House.

DeAngelis says hundreds of Columbine students want to return to their school

The president also reminded school officials across the country of federal programs to help prevent violent eruptions of rage.

With Columbine closed indefinitely, Principal Frank DeAngelis said students will resume classes at a building off campus next Thursday.

Columbine students, staff and faculty will share nearby Chatfield High School, with Columbine classes taking place in an afternoon split session.

Authorities also announced on Friday that students could pick up their cars from the parking lot.

The Associated Press contributed to this report.