Where is Van Horn, Sweetney and Williams?

I went to www.nyknicks.com to the roster section and noticed those 3 players are not even there. Do you think there might be another trade with these 3 players? I know Williams will probably be heading shortly

i noticed that too yesterday but i thought it's just an error. if you check their player file, they are still listed as knick players:
http://www.nba.com/playerfile/mike_sweetney/index.html?nav=page
and besides them, thomas, amaechi and trybanski are missing too

thing back to normal again. i felt a bit weird tho