The tornado that hit Harrisburg, Illinois, yesterday - and killed a confirmed six - caused significant infrastructure damage. There are still about 16-hundred Ameren Illinois customers without power in the areas where the damage was most severe. The company estimates most electric service will be restored by the end of the day on Friday.

The power company reminds any relatives of affected customers who need assistance that they can visit the Ameren Customer Service Center at the Harris Pruitt Building on Church Street in Harrisburg from 8:00 a.m. until 6:00 tonight.

 (Copyright WBGZ /