A gunman who opened fire at Great Mills High School in Maryland was killed Tuesday after engaging an armed school resource officer, authorities said. Heibel said the school increased its security nevertheless after social media posts about a possible school shooting "circulated quite extensively." Also last month, the St. Mary's County Sheriff's office said it arrested two teenage boys for "Threats of Mass Violence" and a 39-year-old man on related charges after the teens made threats about a potential school shooting at Leonardtown High School, a high school about 10 miles from Great Mills. The St. Mary’s County Public Schools tweeted counselors and support staff would be on hand at Leonardtown High School. The incident comes more than a month after the school shooting at Marjory Stoneman Douglas High School in Parkland, Florida.

Source: Fox News March 20, 2018 12:39 UTC