Ten people were killed when a gunman opened fire at Oregon"s Umpqua Community College on Thursday, forcing the nation to face yet another mass shooting.

Seven other people were injured, and the shooter is dead, Douglas County Sheriff John Hanlin told reporters. Earlier estimates had put the number of people hurt much higher.

The shooter was a 20-year-old man, according to Oregon Gov. Kate Brown, who ordered flags be flown at half-staff until sunset on Friday.

Barack Obama responded to the attack and called on the tightening of the law regarding weapons