According to Blizzard:

A number of additional accounts and CD keys have been tied to the use of a hack or cheat program while playing StarCraft or Warcraft III on Battle.net. In keeping with our aggressive stance against cheating, we have permanently closed 200,000 StarCraft accounts and 7,000 Warcraft III accounts. We have documented all of the CD keys that were used with these accounts. 4,000 of the Warcraft III CD keys used with the now-closed accounts have been banned from ladder play for one month and 300 more have been banned from ladder play permanently. Repeat offenders risk having their CD keys disabled, which will result in the permanent removal of their copies of StarCraft or Warcraft III from Battle.net.

We will continue to monitor Battle.net for cheating and take action as needed. A false report filed by one player against another will not result in the actions described above.

As always, thank you for your continued support; with your help we have been able to keep Battle.net a fun and safe place to play Blizzard games.