LOGAN COUNTY, Okla. -- The Amber Alert for two young boys in Logan County has been canceled. They have been found safe in Fairview. The mother and the boys are being detained for futher investigation.

Tuesday afternoon their mother, 28-year-old Jessica Evans, made threats to kill them.

Dillon Nelson, 4, and his brother, 7-year-old Even Nelson, were missing and considered in danger.

Police say Jessica Evans took the children and threatened to drive into Lake Overholser before she would let their father, Perry Nelson, have visitation rights.

Evans was treated for a drug overdose Friday. 

A severe thunderstorm watch has been issued for counties in central Oklahoma.

Officials with the City of Guthrie say they have been receiving questions about the levels of the city's lakes.