WELD COUNTY, Colo. - Threats closed two high schools in Colorado on Friday.
Niwot High School in Boulder County was closed Friday after two threats were found at the school during the week.
Parents told 7NEWS that a threat to blow up the school was found scrawled on a bathroom wall on Monday.
On Thursday, a second written threat with a hit list of 30 names was found.
Deputies met with the parents of the students named on the list Thursday evening.
"This [the closure] buys us some time to investigate the threats and determine who is behind them and whether they are credible," said Cmdr. Rick Brough, spokesman for the Boulder County Sheriff's Office.
Weld Central High School in Weld County was closed early on Friday after an anonymous caller said he was going to bomb the school.
Sheriff's officials say the call appears to be a hoax by a 16-year-old student.
Weld Central High School's website said, "Due to a threat received at Weld Central High School and because of inclement weather a decision has been made to release all students early today, Friday, January 11, 2013. Students will be officially released at 1:30 pm. Thank you for your cooperation in our efforts to keep students safe."
In Colorado Springs, police notified school security officers throughout the city Thursday of a report of an alleged threat someone made referring to the school shooting in Newtown, Conn. Police said no specific Colorado Springs school was mentioned.