Valeant stock falls on report of criminal probe

(Reuters) - Valeant Pharmaceuticals International Inc's U.S.-listed stock fell about 10 percent in premarket trading on Thursday after the Wall Street Journal reported that prosecutors had opened a criminal investigation into the Canadian drugmaker. Lawyers at the U.S. Attorney's Manhattan office are probing whether Valeant obscured from insurers its relationship with a specialty pharmacy that helped inflate its drug sales, the Journal reported on Wednesday, citing sources. The investigation cou