SACRAMENTO -- A Sacramento-area man has been arrested for allegedly killing his 9-year-old son in a hatchet attack.

Sacramento police say 36-year-old Phillip Raymond Hernandez was arrested on suspicion of homicide around noon Tuesday.

The Sacramento Bee (http://bit.ly/VadA3y ) reports officers arrived at the suspect's Natomas home after receiving two emergency calls. They found the boy was unresponsive and had suffered from blunt force trauma to the head. He was declared dead at the scene.

Officials say police set a perimeter around the neighborhood and soon found Hernandez, who was detained without trouble.

Police say Hernandez's 12-year-old son was also home but was not harmed. The victim's mother was out of California when he was killed.

In a press release, police said, "There is no explanation for Hernandez' unimaginable actions."

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Information from: The Sacramento Bee, http://www.sacbee.com