The Nikkei 225 has plummeted, falling below 66,000, with some reports indicating a drop of over 1,900 points. The decline is attributed to a selloff in semiconductor stocks, with some outlets also citing a rout in South Korean stocks as a contributing factor. The extent of the drop is somewhat unclear, with reports varying from a nearly 2,000-point decline to a plunge of over 2,900 yen, and a low below 64,000 at one point.