[JoeU.S.]

Last night, looking North-East, around 9:00 I saw two incredibly bright flashes just below the horizon. It was a mostly clear night. their was no indication that their was thunderstorm activity and their was no sound of thunder. could this have been the same event? BTW I live in Michigan.

[blam]

"could this have been the same event? BTW I live in Michigan."

Don't know but, not likely. Maybe another? After the 1908 Tunguska event, people in London were able to read newspapers outside at midnight from the 'glow'.

[RightWhale]

two incredibly bright flashes just below the horizon.

One possibility is a short in the high tension lines or local distribution lines in the power grid. A vehicle hitting a pole or a tree contacting the wires would do it. It could have been a couple of bolides, but two in the same area in a short time is highly unlikely.