A Westmoreland County Sheriff’s Office drug investigation results in 13 arrests for felony narcotic offenses and other charges. The Sheriff’s Office says that “Operation Hammer Down” resulted in a search warrant executed at a New Monrovia Road home on Tuesday. The suspects range in age from 21 to 67. The investigation is continuing and additional arrests are expected. Westmoreland County Sheriff’s detectives worked with the Tri-County Drug Task Force.