Indiana ? A 17-year-old confessed Tuesday to committing a series of highway shootings that killed one man, wounded another and damaged at least four vehicles, authorities said.

Zachariah Blanton was arrested earlier in the day and was jailed in Jackson County. He faced preliminary charges of murder, attempted murder and criminal recklessness, prosecutor Stephen Pierson said.

Blanton, of Gaston, admitted to the sniper shootings during questioning by investigators, but a motive was unclear, State Police Superintendent Paul Whitesell said.

Blanton came to the attention of investigators late Monday after an acquaintance told a Delaware County deputy that the teen might be involved in the shootings, Whitesell said.