Investigators are trying to determine what sickened 130 employees at a call center who complained of breathing troubles and eye irritation.

All 338 workers on duty at ACCENT Marketing Services were evacuated Wednesday afternoon, and 130 were taken to hospitals. Most were treated and released, though three were admitted.

ACCENT spokeswoman Stacy Spradling said she didn't know when employees would return to work.

Police Chief Rick Baker said the air-conditioning system was serviced Wednesday morning. He said investigators would examine filters from the system.