No accidents have been reported related to the two problems, according to Japan's No. 1 automaker on Wednesday. The Securities and Exchange Commission deepened its probe into whether Knight Capital Group ( KCG) did enough to police its trading systems before computer errors caused the brokerage to incur losses of more than $450 million, The Wall Street Journal reported Wednesday. The probe initially focused on what caused the trading errors but it has broadened to look further at Knight Capital's risk-control procedures and its compliance with a rule that requires brokerages to guard against these sorts of problems, the Journal reported, citing people familiar with the investigation. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.