COLORADO SPRINGS, Colo. (AP) — The Latest on a Colorado teenager accused of killing his younger siblings, wounding his father (all times local):

7:30 p.m.

A 19-year-old accused of fatally stabbing his two young siblings and wounding his father is being held without bail on suspicion of two counts of first-degree murder.

The Colorado Springs Gazette reports Malik Vincent Murphy appeared in court by video Wednesday wearing handcuffs and a suicide smock, a thick-padded garment.

Investigators say Murphy told them he carried out Tuesday's attack so he could be alone in the house. He allegedly bought a knife several months ago with the plan of killing his entire family and burying the bodies in the backyard.

Officers called to the home tried to save Murphy's 5-year-old sister and 7-year-brother, who died at the hospital.

The father told investigators he was sleeping in his bedroom with his wife when he heard screaming. He said the teen had previously talked about killing his family.

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7:40 a.m.

A 19-year-old accused of fatally stabbing his two young siblings and wounding his father is due to make his first court appearance Wednesday.

According to court documents, Malik Vincent Murphy told investigators that he carried out the attack so he could be alone in the house. He allegedly bought a knife several months ago with the plan of killing his entire family and burying the bodies in the backyard.

Officers were called to the home early Tuesday and tried to save Murphy's 5-year-old sister and 7-year-brother but they later died at the hospital.

The father, Jefferson Murphy, told investigators he was sleeping in his bedroom with his wife when he heard screaming in the basement. He said the teen had previously talked about killing his family.