Federal investigators are trying to track down a suspicious package sent to former Vice President Joe Biden that is still making its way through the postal system, CNN reports. Two law enforcement sources cited in the report said a package similar to several others containing suspicious devices and sent to former Democratic leaders and officials had been sent to Biden but was returned to sender because it was misaddressed. The package is believed to have featured a return address listing Rep. Debbie Wasserman Schultz (D-FL), according to CNN. Several other suspicious packages containing explosive devices were sent to former President Barack Obama, Hillary Clinton, philanthropist George Soros, and former CIA director John Brennan on Wednesday, among others. No further details were immediately available on the whereabouts of the latest package.