 The Dow sank 9 tenths percent and the Nasdaq Composite lost 8 tenths percent. The losses came as businesses around the world scrambled to contain the effects of a disruptive technology outage. Cyber security firm CrowdStrike sank after saying the issue lay in a faulty update. The Dow was down 377 points to finish at 40,287. The Nasdaq lost 144 to 7,726.