A Texas teen has been arrested for allegedly murdering his entire family, including his parents and two siblings, because he believed they were "cannibals" and wanted to "eat him."

Cops went to a house in the small town of Nash in suburban Texarkana on Tuesday after receiving reports that a man had harmed his family and was threatening to kill himself. A man, identified as Joseph Flieder, found outside the home informed officers that Cesar Olalde, 18, told him he had killed his family, Law&Crime reported.

"Witnesses on the scene made officers aware of an individual armed and barricaded inside the residence. Law enforcement also received information that multiple lives had already been taken inside the home," Nash Police Department said in a statement.

Police had a "brief standoff" with the "barricaded suspect" before arresting him. Officers located the bodies of his parents, Reuben Olalde and Aida Garcia-Mendoza, elder sister Lisbet Olalde and 5-year-old brother Oliver Olalde in a bathroom. All four were shot "repeatedly" in different rooms of the house and then dragged to the bathroom, police said.

"It appeared as if the victims had been shot at various places in the residence and drug to the bathroom," a probable cause report said, according to NBC. Police also found "multiple spent cartridge casings" on the floor and "blood spatter on multiple surfaces."

Friends and neighbors informed police that Cesar lived in the home with his parents, adult sister, and younger brother. Police also talked to Flieder, who informed them that he was Lisbet's co-worker and had visited the house because she did not show up for work that morning.

Flieder added he and his wife went to the house to check on Lisbet, but nobody responded. At the same time, another family member reached the scene and forced their way inside to check on the family. Cesar brandished a gun at them when they entered the home.

"Flieder reported that the suspect pointed the firearm at him repeatedly during their contact and that at one point, he retrieved a knife and brandished that as well," the probable cause notice noted.

The co-worker added that Cesar told him he killed his family because they were "cannibals" and were "going to eat him." At some point, Cesar also called 911 himself and told the dispatcher he had "pulled the trigger" and shot his family.

Cesar, who recently graduated high school, was arrested and charged with capital murder of multiple persons. He was taken to the Bi-State Jail and his bond was set at $10 million, Texarkana Gazette reported.

Anyone with information about the incident can call the Nash Police Department at (903) 838-0822.

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