The Nikkei 225 has plummeted, with reports of the decline ranging from over 1,900 to over 2,200 points, triggered by a semiconductor selloff. The rout appears to be linked to factors including a slump in US and South Korean semiconductors, as well as earnings from TSMC. The index's exact closing value is unclear, with some reports indicating it fell below 66,000, while another suggests a slight rebound to 64,290.