ABERDEEN, Md. -- A woman killed three people at a drugstore distribution center Thursday in Harford County, Maryland, before shooting herself twice, officials said.
A law enforcement official who had been briefed on the incident provided the casualty toll for CNN. Another source close to the investigation said the woman was a disgruntled employee. She shot herself in the head in an apparent suicide attempt, but was unsuccessful so she shot herself again, the source said.