Market worries about the possibility of losses in the junk bond market have intensified to the point where at least one firm has found itself unable to avoid talking.

Morgan Stanley Dean Witter, whose shares have been buffeted in recent sessions amid investor fears of revenue losses and portfolio hits in its junk bond business, departed from its “no-comment” policy Wednesday and spelled out the degree to which the business line eroded its third-quarter profits and how much more damage it expects in the fourth.

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