With Tuesday's school shooting in Oregon, look back at other major school shootings in U.S. history.
Injuries were reported in a shooting Tuesday morning at a high school near Portland, Oregon. Classes were in session at the time, though it wasn't immediately clear how many people were hurt. Look back at major school shootings in U.S. history.
The National Park Service turned 98 years old on Monday. Learn more about some of America's top national parks here.
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