Apple Inc. (Nasdaq: AAPL) has cut production orders on all three new iPhones introduced in September, according to the Wall Street Journal.

The WSJ reported Monday that lower than expected sales of the new models makes it difficult for the company to anticipate the number of components it will need for the phones.

The move has caused “turmoil” among Apple component producers, the WSJ reports.

Three weeks ago, Apple’s forecast for sales over the Christmas quarter fell under analyst expectations.

Apple stock was down more than 3.5 percent at $186.68 a share in midday trading Monday. It later fell by 3.8 percent.

The slump in Apple shares battered the tech markets as the Dow shed 400 points Monday.