DENVER — Sandwiches from Jimmy John's restaurants may be linked to an E. coli outbreak here sickening eight consumers in early October, according to a report from Fox 31 Denver

An epidemiologist from the Colorado Department of Health and Environment told Fox 31 Denver that the agency is continuing to investigate the case, but thinks the illness could have been caused by tainted produce. 

The health deparmtent is working with the Food and Drug Administration and the Centers for Disease Control on the investigation. 

This is not the first time the restaurant chain has been involved in a foodborne illness investigations. In 2011 alfalfa sprouts served at Jimmy John's caused a salmonella outbreak that sickened 140 consumers in 26 states, and in 2012 raw clower sprouts were linked to an E. coli outbreak that sickened 29 consumers in 11 states. 

The Colorado Deparment of Public Health did not immediately return SN's call to confirm the report.