WASHINGTON (AP) -- Scientists say they are a step closer to developing materials that could render people and objects invisible. Researchers have demonstrated for the first time they were able to cloak three-dimensional objects using artificially engineered materials that redirect light around the objects. Previously, they only have been able to cloak very thin two-dimensional objects. The findings, by scientists at the University of California, Berkeley, are to be released later this week in the journals Nature and Science. The new work moves scientists a step closer to hiding people and objects from visible light, which could have broad applications, including military ones.