 BBC News with Debbie Russ. Severe computer disruption has affected businesses and government services in much of the world. Airports, banks, media outlets and hospitals are among those suffering problems. Big US airlines have grounded flights. Hospital operations were cancelled as medical services were hit in Britain, Israel and Germany. A cyber security company, CrowdStrike, said it had found a defect in its software update for users of Microsoft Windows. It said a fix had been deployed.