Is Apple a victim of hacking?

This afternoon at 1:39 PM, New York time, Apple stock took a massive nosedive in the course of 4 minutes. Losing $10 Billion in value before the stock began to recover. This selling pattern is extremely odd. No clear reason has been found to explain it, and no "circuit breaker" kicked in to arrest it. It has been discovered that a group of hackers had penetrated NASDAQ computer systems for some months. But it was believed that no access to the trading computers had been made. I wonder if the two aren't related.