2 Columbine Students Injured In Hammer Attack LITTLETON, Colorado - Two Columbine High School students in suburban Denver suffered injuries when they were attacked by another student with a hammer. Jefferson County sheriff's spokeswoman Jacki Kelley says the attack occurred Monday morning at school. The 14-year-old suspect was arrested and faces assault charges. Kelley says the condition of the two students was not known. The Littleton high school was the scene of one of the worst school attacks in U.S. history. Students Eric Harris and Dylan Klebold opened fire on April 20, 1999, killing 12 classmates and a teacher and wounding 26 others before killing themselves in the school's library. School officials referred calls to the district, which declined to comment, saying the attack remains under investigation.