All trading on the NASDAQ market was halted on Thursday due to a glitch in a system used to disseminate trading information. First signs of a problem were seen at 10:57 EDT (14:57 GMT) when "momentary interruptions in quote dissemination" hit a system that pools data from exchanges that trade NASDAQ securities. Those problems lasted for six minutes before the system returned to normal operation, according to a market status message issued by the exchange.