The prosecution also claims another man was flown over from Dublin to help build the bombs.
They had heard his plane and were safely in a slit trench when the bombs fell.
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Investigators believe the bombs were detonated using controls from remote-control model cars, two U.S. officials said.
Investigators suspect the bombs were hidden in black duffel bags and left on the ground.
Boston Police Commissioner Edward Davis called the bombs "powerful devices" but declined to describe them further.
Paddick said it wasn't clear whether the bombs were on the trains or in the tunnels.
Some reports have indicated similarities between the bombs used in both sets of attacks.
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Doctors treating the wounded say their injuries indicate that the bombs contained metal shards and other shrapnel.
Law enforcement officials combed through photos and surveillance videos, searching for clues to who detonated the bombs.
Earlier Wednesday, investigators revealed more details about the makeup of the bombs, which exploded 12 seconds apart.
He also said he had been told the bombs were detonated with a "garage door opener-type of device".
Even if most of his countrymen stand behind him in condemning the bombs, King Abdullah has other problems.
The Shin Bet security service says the bombs in the market could be the first of a series.
The Times reported that U.S. intelligence and technical analyses indicated that Shiite militias had obtained the bombs from Iran.
We don't know, as of last night, who planted the bombs along the finish line of the Boston Marathon.
The Air Force began receiving the first of the bombs in September, a time of growing tensions with Iran.
The church was totally destroyed by the bombs, leaving only the altar standing, but was rebuilt after the war.
Shortly after 1pm, as the emergency workers were coming in, one of the bombs blew up, apparently by accident.
Mr Kohl was a war child, growing up as the bombs fell on his home town in the Palatinate.
But, for the moment, both the bombs and the murder remain unnervingly mysterious.
But rather than avoiding the bombs, Brown said finding and dismantling the groups that lay them should be the priority.
He said that when the bombs went off, the university gates were closed, and campus security would not open them.
Her mother, Carol Downing, 57, was less than a half mile from the finish line when the bombs stopped the race.
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The international law enforcement agency's Orange Notice includes photographs of the bombs used on Monday and fingerprints of the two suspects.
For one thing, they say they're getting better at detecting the bombs, which the Pentagon calls IEDs, for improvised explosive devices.
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Federal agents have joined the investigation, and the bombs were sent to an FBI lab to determine what materials were used.
The bombs at Pearl Harbor destroyed the very idea that America could live in isolation from the plots of aggressive powers.
The previous day, a law enforcement official said at least one of the bombs that exploded was set off by remote control.
It is at least possible that these cameras might have alerted officials to the presence of the abandoned backpacks containing the bombs.
Even without unexploded devices, investigators can still sift through the blast marks of the detonated devices to determine how the bombs were constructed.
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