Authorities on three continents were investigating on Friday whether suspicious packages shipped from Yemen to the United States aboard cargo planes could be part of a terrorist plot.
U.S. officials say they are increasingly confident that the packages are part of a plot by Yemen's al-Qaida branch.
Yemen is home to the al-Qaida branch that tried to bomb a U.S.-bound airliner on Dec. 25, Christmas Day.
Intelligence and law enforcement officials discovered suspicious packages in Britain and Dubai late Thursday night, prompting national security officials to alert U.S. President Barack Obama to a potential terrorist threat, the White House said.
A United Arab Emirates security source reported later Friday that a suspicious device discovered in an air cargo shipment in Dubai, headed for the U.S., did in fact contain explosive materials.
The package containing explosive material was addressed to a Chicago-based Jewish institution.
It was the first confirmation that any of the suspicious packages contained explosives.
The source, speaking on condition of anonymity because of the sensitivity of the issue, said late Friday the explosive device was found in the last 24 hours in a courier company's regional hub and originated in a shipment from
The package in Britain, discovered aboard a plane in the East Midlands, about two hours north of London, contained a toner cartridge with wires and powder. It was found during routine screening of cargo in the United Kingdom, prompting authorities to scour three planes and a truck in the United States on Friday, U.S. officials said.
The president directed U.S. intelligence and law enforcement agencies, and the Department of Homeland Security, to take steps to ensure the safety and security of the American people, and to determine whether these threats are a part of any additional terrorist plotting, the White House said in a statement.
Searches also were conducted in Philadelphia, Newark, New Jersey and New York City. The packages were being sent via UPS.
Transportation Security Administration spokeswoman Kristin Lee says the planes in Philadelphia and Newark were swept. The planes were moved away from terminal buildings while law enforcement officials investigated.
Two jets in Philadelphia belonging to UPS were searched. A federal law enforcement official, who was not authorized to provide information on the investigation, told the AP that nothing suspicious was found on them.
A source with knowledge of the situation in Newark who was not authorized to speak publicly said the FBI and a bomb squad checked two packages there and gave the all clear.
New York Police Commissioner Ray Kelly said that the NYPD removed a package from a UPS truck in Brooklyn, tested it for possible explosives and found it not to be dangerous. The package was an envelope that came from Yemen, appeared to contain bank receipts, and was addressed to the JP Morgan Chase bank in Brooklyn, Kelly said. The package arrived on a plane that landed at Kennedy Airport, he said.
Yemeni authorities reached by the AP declined to comment. Many offices were closed because Friday is a day off in Yemen.
Mike Mangeot, a spokesman for Atlanta-based United Parcel Service Inc., said two planes in Philadelphia that had come from Cologne, Germany, and Paris were being investigated.
Out of an abundance of caution, those aircraft have been isolated, and they are looking into the shipments in question there, he said.
A third plane had arrived in Newark, New Jersey, from East Midlands airport in England. That plane was cleared and flew to UPS' main hub in Louisville, Kentucky, on its usual route, Mangeot said.
In central England, police had evacuated a freight distribution building at East Midlands Airport after a suspicious package was reported at 3:30 a.m. Police and emergency workers examined the package and lifted the security cordon by midmorning, but Leicestershire Constabulary later said officers were re-examining it as a precaution.
Sarah Furbank, a passenger who was about to board a plane out of East Midlands Airport, said that she had noticed an increased security presence.
"There were quite a few police cars round the edge of the airport," Furbank told The Associated Press. "Apparently there was an incident earlier according to staff but they didn't go into detail."
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