Authorities investigating rock attacks at the Gorge

GEORGE, Wash. (AP) — Authorities in Washington state are investigating after two men were struck in the head with rocks during a weekend concert at the Gorge Amphitheatre.

Grant County Sheriff’s spokesman Kyle Foreman says the attacks happened around the same time but a good distance apart at the Phish concert Saturday night.

One man remains hospitalized while the other has been released.

Joe Louis Allen Jr. said in an earlier interview that he was enjoying the concert when he was clobbered in the head. The 46-year-old Port Angeles man says he wants to find the person responsible. A close friend said Thursday that Allen underwent neck surgery Wednesday and has a long recovery ahead.

Foreman says authorities are aware of speculation on social media that alleged neo-Nazis were responsible but they can’t currently link them to the attack.

There are no suspects. Detectives are asking witnesses to come forward.