By Laura Smith-Spark BBC News Eighteen months after the devastating Indian Ocean tsunami, hundreds have died after a giant wave struck the Indonesian island of Java. Their deaths have raised questions about the failure of a promised Indian Ocean tsunami early warning system to sound an adequate alert. More than 300 people died and about 140 were reported missing after the tsunami struck Java’s southern coast on Monday. Witnesses have said people had little or no warning to flee the 2m-high wave triggered by an undersea earthquake.