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A woman killed her husband and their two children in a Nevada murder-suicide that was discovered this week, police said Friday.

Joan Huber, 53, fatally shot her husband, Adam Huber, 50, and then their two teenagers before killing herself sometime before Wednesday when officers were called to their home in Reno, police said in a statement.

The case is under investigation and there is no known motive in the killings, police said.

Police went to the family's home around 11 a.m. Wednesday after family and friends reported not having seen the couple or their children for several days, NBC affiliate KRNV of Reno has reported.

The children were students at Damonte Ranch High School, Reno police spokesman Officer Travis Warren has said.

The boys were identified by the station as 16 and 17 years old.