Tweet Authorities Investigating Several Suspicious Packages That Originated From Yemen DEVELOPING: Authorities are methodically sweeping and clearing cargo flights that were held at U.S. airports in Newark and Philadelphia after foreign law enforcement agencies reported finding suspicious packages from Yemen in London and Dubai.  Law enforcement agencies are investigating whether packages found on UPS planes at Philadelphia International Airport, Newark Liberty Airport, East Midlands airport in central England and a FedEx facility in Dubai were part of a dry run mail bomb plot, an attempt to get explosives into the United States or an attempt to send materials to third parties in the U.S. for another plot. Officials say Al Qaeda in the Arabian Peninsula may have been involved. The FBI reported that two of the suspicious packages were addressed to religious institutions in Chicago. "All churches, synagogues and mosques in the Chicago area should be vigilant for any unsolicited or unexpected packages, especially those originating from overseas locations," Chicago FBI spokesman Ross Rice said. Ross would not identify the intended recipients of the packages but said they had been contacted. U.S. officials were placed on high alert after intelligence and law enforcement agencies discovered suspicious packages on two planes in transit to the United States late Thursday night. "Based on close cooperation among U.S. government agencies and with our foreign allies and partners, authorities were able to identify and examine two suspicious packages, one in London and one in Dubai. Both of these packages originated from Yemen," White House Press Secretary Robert Gibbs said in a statement. "As a result of security precautions triggered by this threat, the additional measures were taken regarding the flights at Newark Liberty and Philadelphia International Airports. Given the origin of the packages, Al Qaeda in the Arabian Peninsula "is at the top of the li...