Oregon dating scene
Mercer had been living at an apartment complex in nearby Winchester.
At a news conference late Thursday night, a visibly angry Hanlin said he would not name the shooter."I will not name the shooter.
I will not give him the credit he probably sought prior to this horrific and cowardly act," he said.
Law enforcement sources also tell CBS News four guns -- a combination of pistols and a rifle -- were found at the scene of the shooting.
Posts on an online blog that appears to belong to Mercer reference multiple shootings, including one in Virginia in August that left a television news reporter and cameraman dead. when a documentary about the Newtown shooting was posted.
The shooting happened at Umpqua Community College in Roseburg, about 180 miles south of Portland, in Douglas County.
Oregon Attorney General Ellen Rosenblum said earlier Thursday that at least 13 people had died in the shooting and another 20 were wounded, but in a news conference Thursday night Hanlin said the number of fatalities stood at 10.
The sheriff acknowledged that there had been conflicting reports but that is the most accurate number they have at this time.Two law enforcement sources told CBS News the shooter has been identified as 26-year-old Chris Harper Mercer.