Breaking news out Maryland. Another deadly school shooting has left at least one student in critical condition.
Great Mills High School in Maryland was on lockdown following reports of a shooter on campus. The sheriff said the school resource officer killed the shooter and suffered no injuries.
A male student is in stable condition and a female student is in critical condition.  
Sheriff Tim Cameron says local authorities were prepared for the worst. The sheriff also said that the shooter and the female victim may have had a relationship.
This is the 17th school shooting in the United States since January 1.