Minh said:
What do you mean "suspended"?

I guess Apple itself can choose not to trade, but other people who own APPL stocks can buy/sell right? Anyway, the article mentions trading resumes after hour... and currently down 10%

What happened is the stock was halted to where no one can trade the stock.  This is a common occurance in the market whenever there is a major news item that comes out regarding a company.  This way investors have time to digest the information and everything happens in an orderly fashion.