WCAC

Waltham Fire responded to Five Guys at 1030 Main Street Friday morning for an employee who had fainted.

The employee was taken to Newton-Wellesley Hospital.

Roughly two hours later, a similar incident summoned WFD back to the scene.

By 1:30 p.m., three more employees had been transported to the hospital, according to news photographer Peter Lobo.

Firefighters continued to seek the cause. At 2:15 p.m., they requested a Tier 1 HazMat response.

Photos: Peter Lobo