RELATED VIDEO CNN has obtained an audio tape of Harris and Klebold from a court hearing they attended last year, and CNN's Tony Clark speaks to the judge about the boys (April 27) Real 28K 80K Windows Media 28K 80K INTERACTIVE Amid grief, moments of reflection Audio and Images Interactive Map: Recent school shootings in the U.S.  ALSO: Rest in Peace: Littleton to bury its last victim 5 middle school students charged with conspiracy to blow up Brooklyn school  MESSAGE BOARD: Listening After Littleton  CNN IN-DEPTH SPECIAL: Are schools safe?

April 29, 1999
Web posted at: 10:34 a.m. EDT (1434 GMT)

In this story: 'There will be an arrest' Final funeral Return to school delayed RELATED STORIES, SITES

LITTLETON, Colorado (CNN) -- Police are on the verge of arresting a man who may have illegally sold the semiautomatic handgun used in the Columbine High School massacre, authorities told CNN Thursday.

The man's name and details on his possible connection with gunmen Eric Harris, 18, and Dylan Klebold, 17, were not immediately available. It is illegal to sell handguns to minors.

Steve Davis, a spokesman for the Jefferson County Sheriff's Department, told CNN the man was not considered an accomplice in the April 20 gun and bomb assault but "if he knew what (the gunmen's) intent was ... charges could escalate."

Davis said prosecutors and the man's attorney are "trying to work out some type of negotiation, right now, for him to turn himself in."

Jefferson County District Attorney David Thomas told NBC's "Today" show on Thursday that "there will be an arrest in this case."

Thomas said authorities are discussing the man's surrender with his attorney and it would probably take place in the next two days.

The district attorney called the sale of the gun, a semiautomatic TEC DC-9 handgun, a "private transaction."

Harris and Klebold, hiding their arsenal under black trench coats, killed 13 people and wounded more than 20 others at the school April 20 before killing themselves. They had four guns and also left more than 50 bombs at the school and in their homes.

The Denver Post reported Thursday that agents of the federal Bureau of Alcohol, Tobacco and Firearms on Tuesday visited the Blackjack Pizza shop where Harris and Klebold worked. It quoted unidentified sources as saying a pizza delivery driver may have introduced Harris and Klebold to the seller.

Authorities say the other three guns -- two shotguns and a rifle -- used in the massacre were bought by Klebold's girlfriend, shortly after she turned 18 last fall.

They describe her as a witness rather than a suspect in the rampage, because it is not illegal to provide a shotgun or a rifle to a minor.

A semiautomatic TEC DC-9, similar to the one police say was used in the Columbine High School shootings

The girlfriend, who attended the prom with Klebold days before the shootings, is just one of 600-plus leads being pursued in Colorado's largest-ever criminal probe.

Mourners, drained by a week of funerals, turn Thursday to the final service for the Columbine victims as Isaiah Shoels, 18, is laid to rest.

The aspiring music industry executive, who overcame his short stature (4-feet-11) and serious health problems to become an athlete, was the only African American who died in the carnage.

"They said he would never play sports," recalled his father, Michael. "You know he conquered that. He not only played sports, he was one of the best."

Isaiah, who played football for another school in the area before transferring to Columbine High School, excelled at sports, his father says

Witnesses said the gunmen targeted athletes and minorities during their attack.

But Michael Shoels said things would have been different if the killers had looked beyond the color of Isaiah's skin and into his son's heart. "If those guys had any idea who Isaiah really was ... they wouldn't have (done) it." (374K/13 sec. AIFF or WAV sound)

Thursday was to have been the day that Columbine High School students resumed classes, but because of this week's funerals, their return to school was rescheduled for Monday.

Students are to begin classes Monday at Chatfield High, a rival school a few miles away.

Isaiah's father, Michael, says his son overcame adversity all of his life 249K/7 sec. AIFF or WAV sound

The afternoon sessions, from 12:50 p.m. to 6 p.m., will continue until the end of the year, Barbara Monseu, area administrator for the Jefferson County School District told CNN.

She said counseling and other support services will continue to be available for the Columbine students at their new school.

Correspondents Tony Clark and Martin Savidge contributed to this report.