According to the Chicago Sun-Times, a water main break caused
the sinkhole to eat a section of South Wentworth Avenue near
124th Street.  Though the sinkhole was initially small,area
residents say it grew significantly overnight, NBC Chicago
reports. It has now overtaken half the road.  One resident told
CBS Chicago she awoke Monday to the sound of the street
collapsing and went outside to see the hole was now about
20-by-80 feet.  Residents on the block in the West Pullman
neighborhood had their water temporarily shut off as the city
worked to repair the broken water main.