Nasdaq cancels trades in about 50 securities

NEW YORK (Reuters) - Nasdaq Inc said it cancelled trades that spanned a two-minute period before the opening bell on Wednesday which affected about 50 securities. The exchange initially said it was investigating "potentially erroneous transactions" that occurred between 9:23 a.m. ET (1323 GMT) and 9:25 a.m. ET (1325 GMT) and included names such as Michaels Companies , Mercury General Corp and Mohawk Industries . Within the hour, Nasdaq announced that it had determined to cancel all of the..