On August 5th, according to market data, the Japanese stock market continued to decline, with the TOPIX index and the Nikkei 225 index both falling by more than 6%. The TOPIX index triggered the circuit breaker mechanism. The KOSPI index in South Korea expanded its decline to over 4%. In addition, the decline in US stock index futures widened, with the Nasdaq 100 index futures falling by 2%.Earlier, there were reports that the United States told the G7 that Iran may attack Israel within the next 24 hours.