HILLSBORO, Ore. (KOIN) — Many questions remain after dozens of Intel employees had breathing issues due to the second HazMat situation in one week at the facility.

Emergency workers still don’t know what caused the health issues and it doesn’t appear that Intel knows exactly what happened either.

The Hillsboro Fire Department said it’s not unusual for them to respond to scenes where they don’t know what potentially hazardous materials could be waiting.

They said Intel has a thorough emergency response team of its own, including HazMat responders. When EMTs arrived Monday, the manufacturing support building had already been evacuated.

This was the second time employees have been affected, so Intel was already closely monitoring its air and systems. They know this wasn’t a hazardous leak.

“If there had been any sort of a large-scale release that would have been an environmental hazard or a hazard to the public, we would have known that going in,” Hillsboro Fire division chief Nathan Leek said.

The big question remains — what does Intel do moving forward if they don’t figure out what the problem is? After the first incident on Nov. 29, the building was reopened 9 hours later. Now, a full day after it was evacuated the second time, the building is still closed.

All the people who were hospitalized Monday have been released.

KOIN 6 News reached out to Intel to see what’s being done moving forward but they did not respond.