Two wounded in Maryland school shooting

GREAT MILLS, Maryland - In the latest school shooting in the United States, the gunfire was over and done with in less than a minute.

This time the shooter, a 17-year-old student, was killed. A 16-year-old girl, who authorities said had some type of relationship with the shooter, was critically injured and a 14-year-old boy was also wounded. And the school resource officer who responded inside of 60 seconds and fired off a shot at the attacker was praised as a hero.

Tuesday's shooting erupted at Great Mills High School in southern Maryland, about 100 kilometers south of US capital Washington. It came a month after 17 people were killed at a Florida high school, and intensified calls for Congress to act on gun violence at schools.