What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.

Amgen Inc on Wednesday said the U.S. Internal Revenue Service (IRS) is seeking additional back taxes of $5.1 billion, plus interest and penalties, related to the drugmaker's 2013 to 2015 accounting for profits between the United States and Puerto Rico, the location of most of its manufacturing operations.
moderately negative