A woman armed with a handgun opened fire at a Maryland warehouse complex where she was employed, killing three people and wounding three others before taking her own life. There are reports the woman had a work-related grievance and that the shooting started in the break room of the Rite Aid distribution center. The warehouse is in the small town of Aberdeen, north-east of Baltimore. One local resident, Colleen Hendrickson, said: 'You wouldn't think in this kind of sleepy and calm area that anything like this would happen'