  An intense type III radio storm has been disrupted by a fast halo coronal
mass ejection (CME) on 2000 April 4. The CME is also associated with a large
solar energetic particle (SEP) event. The storm recovers after about10 hrs. We
identified another CME that occurs on 2003 November 11 with similar CME
properties but there is no type III storm in progress. The 2003 November 11 CME
is also not associated with an SEP event above the background (less than 2
pfu), whereas the one with type III storm has an intense SEP event (about 56
pfu). One of the factors affecting the intensity of SEP events is the presence
of seed particles that are accelerated by CME-driven shocks. We suggest that
the type III storm source, which accelerates electrons to produce the storm,
also accelerates ions that serve as seed particles to the CME shock.
