Any unexploded devices would be valuable evidence for investigators to determine who was behind the bombing.
The unexploded bomb left crucial evidence intact that detectives used to trace Mr Shahzad.
The FSA will try to get the unexploded canister out of the country for testing, he said.
The unexploded bomblets are a danger to residents, especially children who might pick them up, Amnesty says.
When pressed he said it was a piece of unexploded ordnance left over from the Vietnam War.
He was killed when he picked up unexploded artillery after leaving his checkpoint and walking into a field.
Military property contains a lot of unexploded ordnance and polluted groundwater, two of the trickiest types of contamination.
The United States maintains that most of the unexploded projectiles on Empire Range have been found and destroyed.
It would pay for locating, disarming and removing mines and other unexploded ordnance in the U.S. sector of Kuwait.
Electricians were shocked to find an unexploded World War II bomb at a former home of a war veteran.
Unconfirmed reports said two other unexploded devices were found near the end of the race but were safely defused.
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The debris and unexploded munitions clogging the river are causing severe economic disruption.
It may seem surprising that unexploded bombs remain undiscovered in Berlin and other German cities decades after World War II ended.
Many unexploded bombs dropped by Allied forces during World War II remain undiscovered in Berlin and other cities some seven decades later.
At least two unexploded devices were found in their house, police said.
Even without unexploded devices, investigators can still sift through the blast marks of the detonated devices to determine how the bombs were constructed.
He said federal investigators were examining the two unexploded devices which were found on the busy Jangli Maharaj Road area, where the blasts occurred.
The abandoned, unexploded ordnance, combined with oil from leaks or deliberately flooded trenches, has left a hazardous environment for rehabilitation workers to operate in.
But in one of the driest Novembers on record, Rhine River levels have dropped dramatically, revealing an unusually large trove of unexploded bombs in its bed.
Mr. Lenz added that as unexploded bombs grow older, they are becoming ever more unstable, and increasingly likely to explode, as the elements deteriorate their chemical detonators.
Any unexploded devices could provide a treasure trove of information such as fingerprints and indications of the bomb maker's design, said the former federal law enforcement official.
They leave behind unexploded munitions, toxic waste and polluted groundwater, all of which must be cleaned up at military expense before being handed over for civilian use.
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Investigators on Friday recovered an unexploded bomb and other explosives material from what they said was the "control centre" for the attacks - room 1808 in the Marriott.
Such unexploded mines are still commonly found in rural areas.
The quarry cannot be dredged to clean it because during WWII, the Germans who occupied the island used it as an armaments dump and tonnes of unexploded ordnance remain.
Nevertheless, with the exuberance of youth, I tired to make my way to school by bicycle and was prevented from entering several roads because of craters and unexploded bombs.
Proposals to build homes at Lodge Hill, which Medway said is believed to have unexploded ordnance, have been in the pipeline since the mid-1990s and outline plans have been submitted.
The 750kg (1, 650lb) unexploded World War II (WWII) weapon was placed on the sea bed after it was caught in the nets of a fishing boat earlier in the week.
Numerous unexploded bombs have since been discovered and detonated.
Note that the area still has unexploded bombs, so take care when walking to stay within designated areas - only the three main Plain of Jars sites are considered reasonably free of UXOs.
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