Cause of today's outage in SE Chicago

Mid-morning today the Internet service went down.  The initial text messages and Xfinity app said expected to be restored at 11a, then 1, then 5, then 7pm.  All the while the outage map showed over 2000 people affected from South Chicago to West Chatham.  The cause was listed as "network damage."  What kind of damage (equipment failure, purposeful damage, accidental utility problems, etc.) and is it likely to be down tomorrow?