By Josh Meyer
The Los Angeles Times
Read the NYPD report (PDF)
CHICAGO — In December, when a young Muslim convert named Derrick Shareef was arrested near here for allegedly plotting to blow up holiday shoppers with hand grenades, he was described as one of those homegrown "lone wolf" terrorists that the FBI had been warning about for more than a decade.
But federal law enforcement officials have changed their minds about Shareef — and about what kinds of bred-in-America Islamic militants represent the greatest threat to the United States.
NYPD warns of homegrown terrorists in new report