Updated at 6:24 p.m.

Eleven employees at Intel in Hillsboro were taken to hospitals for evaluations Thursday after having trouble breathing while working on the campus, authorities said.

It’s not clear what caused the issues, according to Bruce Montgomery, a Hillsboro Fire & Rescue spokesman. He said crews were alerted around 4:15 p.m. about possible “toxic exposures” at Intel’s Ronler Acres campus, and emergency responders were later led to the workers by security.

Hillsboro fire crews and gas monitors at Intel found no hazardous gases were released on the work campus, Montgomery said.

All 11 people were conscious when they were taken away for treatment. Montgomery said he didn’t know what department the affected employees were working in.

A spokeswoman for Intel declined to comment Thursday.

-- Everton Bailey Jr.

ebailey@oregonian.com | 503-221-8343 |@EvertonBailey