The people familiar with the search didn’t say where …

The people familiar with the search didn't say where the devices are currently or what information was being sought, but seizing the electronics from a high-profile business leader like Walter is a significant investigative step. Probes by prosecutors can end without charges being brought. The search warrant was one of several executed last September, according to other people with knowledge of the probe, who asked not to be identified discussing a confidential matter. Federal prosecutors in Manhattan have been investigating potential financial improprieties at two of Walter's insurance companies and at Guggenheim Partners, the financial firm Walter leads, Bloomberg News has reported.