Comedy Central's "Colbert Report" is off the air, and it's a mystery why.

An expected live version of the show was replaced by a repeat Wednesday. Comedy Central said Thursday's live show will be off, too.

The network said it was airing the repeats "due to unforeseen circumstances" but offered no other explanation.

Stephen Colbert's popular "fake commentary" program airs Monday through Thursday, following "The Daily Show" with Jon Stewart.