JP Morgan Asset Management Co. made sell orders of TOPIX-linked basket (Tokyo Stock Exchange Stock Price Index) by mistake Monday as it intended to make sell orders of Nikkei 225 basket immediately after the bell at the beginning of afternoon transaction, the company announced later the same day.

According to the Daily Yomiuri, JP Morgan said that the orders may have influenced the market to some degree and still trying to discover actual amount of damage, according to the media.

Tokyo Stock Exchange said it began to look into the matter, the sources reported