More than 100 people gathered Friday along a chain-link fence outside a badly damaged Illinois silicone factory to remember four men who died in an explosion at the facility.

The mourners at AB Specialty Silicones factory north of Chicago included friends, relatives and co-workers of the men whose bodies were pulled from the rubble over the last week after the May 3 blast . Four wreaths of white flowers were placed on stands while people hugged and cried.

Those killed were Byron H. Biehn, 53, of Brighton Township, Wisconsin; Jeff Cummings, 57, of Kenosha, Wisconsin; Daniel Nicklas, 24, of Beach Park, Illinois; and Allen Stevens, 29, of Salem, Wisconsin.

Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)
Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)

The Waukegan explosion is under investigation. Fire officials have said they believe it was the result of an accident in factory processes.

Speakers on Friday included Waukegan’s mayor, the city’s fire chief and Lake County Coroner Howard Cooper, who said the service was about healing. But Cooper told those gathered, “I cannot lie, it’s hard.”

Company general manager Mac Penman said he plans to rebuild and reopen the facility.

Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)
Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)

“We have lost our friends and colleagues,” Penman said. “But the families have lost fathers, sons, husbands and brothers.”

Meanwhile, Waukegan city spokesman David Motley said the blast affected seven nearby buildings. The owners of the buildings have been asked to complete independent structural analyses of the properties.

“Unfortunately, not all of them are OK,” Motley said.

AB Specialty Silicones general manager Mac Penman, right, hugs people during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. (Joe Lewnard/Daily Herald via AP)
AB Specialty Silicones general manager Mac Penman, right, hugs people during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. (Joe Lewnard/Daily Herald via AP)
Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)
Attendees listen during a memorial, Friday morning, May 10, 2019, in Waukegan, Ill. , for the victims of a recent explosion at the AB Specialty Silicones plant. (Joe Lewnard/Daily Herald via AP)

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