An Intel spokeswoman said all employees were evacuated from the Manufacturing Support Building and no work will continue there until further notice.

HILLSBORO, Ore. — Six employees from Intel's Hillsboro campus were taken to a hospital for mysterious respiratory issues for the second time in less than a week.

An Intel spokeswoman said all employees were evacuated from the Manufacturing Support Building and no work will continue there until further notice.

All six workers were released from the hospital after suffering from respiratory irritation.

Fifteen employees went to hospitals Thursday complaining of difficulty breathing. The employees reported similar respiratory irritation and "minor breathing difficulty," according to Intel. All of them were home from the hospital by late Friday.

Intel said previous and current investigations have shown no hazardous materials were released.