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(AP) -- COLUMBIA, S.C. (AP) -- The manufacturer of Learjet is brushing off blame for a crash in South Carolina last year that killed four people and injured two music celebrities.

Attorneys for Learjet Inc. and Bombardier Aerospace Corp. said in a counterclaim filed Monday that any alleged damages are the fault of the jet's owner or operator, not its manufacturer.

Both companies were sued last month by Inter Travel & Services Inc. and Global Exec Aviation Inc. The firms owned and operated the Learjet that crashed at Columbia Metropolitan Airport on Sept. 19, injuring rock drummer Travis Barker and celebrity disc jockey DJ AM, whose real name is Adam Goldstein. The pilot, co-pilot and two of Barker's assistants were killed.

Investigators have not determined the cause of the crash.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

APNP 02-03-09 1803EST

(Copyright ©2009 by The Associated Press. All Rights Reserved.)