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US and European authorities are attempting to thwart what appears to be an ongoing bomb plot in which more than a dozen potential bombs were shipped to the US aboard numerous air carriers, federal sources told ABC news.

The devices may have been distributed onto UPS cargo trucks in New York and possibly New Jersey. So far no active devices have been found in the United States, officials said.

Other potential devices have been found in London, according to ABC News. It is unknown how many if any of those suspected devices were live.

Authorities in the U.K. said officials discovered that a toner cartridge on one plane had been manipulated and found wires attached to it and white powder. A senior FBI official says explosive tests run on the package in Birmingham, England were negative.

New York, Philadelphia and New Jersey authorities as well as federal authorities are attempting to track down the suspected improvised devices and bomb technicians are on the scene of the numerous suspected devices already located at banks in Queens and at other locations.

One of the UPS flights landed at Newark Airport, and the plane was taken to the UPS cargo facility to get checked out.

The New York Police Department’s bomb squad also stopped a UPS truck on the Queensboro Bridge as part of the investigation. Authorities also checked packages at a facility in Queens and another location in Brooklyn.

Two planes were also getting checked in Philadelphia.

The planes involved: UPS Flight 218, a Boeing 767 that departed Paris and landed in Philadelphia; UPS Flight 204, a MD 11, that was scheduled to depart Philadelphia for Louisville; A UPS Flight that arrived at Newark Airport from somewhere in Europe, off loaded packages at their loading dock. That cargo area is now being searched.

Operations at the two airports have not been impacted.

While details remain sketchy, ABC News reports it appears England was a transshipment point in the plot in which devices were believed to be placed aboard cargo planes for shipment to targets in the U.S.

It is unknown who is behind the plot, nor how authorities learned of it.

ABC News reports British police were already investigating suspicious packages there on Thursday, according to two US sources.

Bomb technicians, TSA bomb appraisal officers and emergency service officers are involved in the investigation in Queens, Newark and Philadelphia at this time, officials said.

The Transportation Security Administration says it is aware of the situation and monitoring the investigation.

“Out of an abundance of caution the planes were moved to a remote location where they are being met by law enforcement officials and swept,” the TSA said in a statement.

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(Source: WABC)