The aircraft involved was N526MD according to the Brazilian Air Force website.
Going from an online translation it suggests that a loud bang was heard on the ground as the aircraft took off, the tower questioned the pilot who said there was nothing wrong. When it became obvious on the ground that something had detached from the aircraft the pilot was contacted again and admitted there was an engine problem but was ok to carry on with the flight.
Disclaimer - The above is my interpretation of an online translation which can be notoriously unreliable.
My wings are like a shield of steel.
Didn't the crew notice a massive drop of in engine efficiency en-route? It looks as if everything immediatly after the low pressure turbine fell off.
In an unpleasant kind of way this could be a testament to the ruggedness of some of todays aircraft.
If this is just a sensorless exhaust cone, the engine may continue to run happily without a single warning. Maybe spool up times may be influenced. What is certain is that this will cut down on the engine's thrust, as the exhaust pipe converts a good deal of the thermal energy in the exhaust gases to kinetic energy, thus propelling the aircraft. In a few words, it accelerates the airflow. The engine then needs more "effort" to push the gas through the pipe. If the pipe is removed the engine may run faster, but produce less thrust. Pilots may have seen an engine runnig faster than the others as a warning...
There's some more information and pictures about the incident here
It says that they flew on with that engine shut down
Not a pretty sight