COLUMBUS (AP) -- Authorities in Columbus were trying to determine the source of several explosions downtown overnight that blew off manhole covers, set off fire alarms and flooded emergency responders with calls.
At least three blasts, apparently underground, occurred in the early hours of today.
Police cordoned off streets, and the electric company cut power to several surrounding buildings. Some traffic lights were knocked out.
Witnesses saw smoke coming from one of the manholes.
The investigation was continuing. No injuries were reported.