Apple CEO Tim Cook’s Surprise Move to Reassure Investors

Amid stock market worry, Cook gives rare mid-quarter comment on Apple.

Cook's statement, which was sent to CNBC and was confirmed by ABC News, comes the same day as the Dow fell about 1,000 points at the opening bell amid a global sell-off and was on pace for a record drop before recovering later in the day.

That accelerated growth has come from increased iPhone activations over the past few weeks, along with the company's App store in China having its best performance of the year over the past two weeks, Cooks said.

ABC News' Zunaira Zaki contributed to this report.