<p>MIAMI (CNN) -- Federal officials in Miami told CNN Saturday they had arrested a south Florida Muslim activist with ties to "dirty bomb" suspect Jose Padilla.</p>
<p>Adham Amin Hassoun was arrested during a Wednesday night traffic stop by members of South Florida Joint Terrorism Task Force, according to FBI spokeswoman Judy Orihuela and Immigration and Naturalization Service spokesman Rodney Germain.</p>