Roses, balloons atop Rebel Hill. By Trent Seibert Denver Post Staff Writer. April 21 - Dressed in a brown trench coat, the teenager stood out from most of the others Thursday as he climbed Rebel Hill ...

LITTLETON, Colo. — EDITOR’S NOTE — On April 20, 1999, two teenage boys dressed in black trench coats went on a killing rampage at Columbine High School in suburban Denver.

Word spreads: The “Trenchcoat Mafia” has gone nuts. Many of the 900 students in the building duck into closets and bathrooms, under tables and chairs. A couple call 911 with cellular phones.

Word spreads: The “Trenchcoat Mafia” has gone nuts. Many of the 900 students in the building duck into closets and bathrooms, under tables and chairs. A couple call 911 with cellular phones.

Word spreads: The “Trenchcoat Mafia” has gone nuts. Many of the 900 students in the building duck into closets and bathrooms, under tables and chairs. A couple call 911 with cellular phones.

Word spreads: The “Trenchcoat Mafia” has gone nuts. Many of the 900 students in the building duck into closets and bathrooms, under tables and chairs. A couple call 911 with cellular phones.