Omaha Police respond to North High School; no threat found

OMAHA, Neb. -- Authorities said threats made to Omaha North High School Thursday were unsubstantiated. 

In a letter to staff and families Thursday, Principal Colette Nero said a call came in from an out-of-town area code alleging a threatening situation was unfolding at the school. 

Police said they checked the school and found no viable threats. 

Police said they're still investigation the origin of the call.