Excerpts from abc7chicago.com:

Five workers were injured Tuesday by an electric shock while hanging new gutters at a home in Grand Ridge, near Streator, in LaSalle County. 

Fire officials said they got a call about the incident around 11 a.m. when the five workers were putting up aluminum gutters that came into contact with a power line. The workers were all on aluminum ladders and touching portions of the house when the gutter became electrified. All five were shocked at the same time and fell 25 feet to the ground.

A total of eight ambulances were called in response to the incident. Three of the workers are hospitalized in critical condition; the other two are in serious condition. One worker had to be taken by Life Flight from the scene to a hospital, while another worker had to be taken by Life Flight from a hospital in Peoria to a different hospital in Springfield.

The Grand Ridge Fire Department is still investigating the incident, but the fire chief did note that if the power company had been notified about the work they would have sent someone out to sheath the wires ahead of time.

thanks Martin