Boston Bombing Suspects' Potential Bomb-Maker Connection

Officials increasingly concerned that marathon bombers may have had outside help.
3:00 | 04/27/13

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Transcript for Boston Bombing Suspects' Potential Bomb-Maker Connection
-- fresh suspicions in Boston ABC news has learned that law enforcement officials. Are now increasingly concerned that the suspects may not have acted alone that they could -- outside help from a master bomb maker. ABC's do you have -- has had more now from Boston -- good morning. Dan good morning to you right now there is more evidence than ever to suggest that the suspect -- bombers. Had this teacher of the sort of master bomb maker overseas. In a new government document obtained by ABC news. Investigators say the bombers like we knew more about. Bomb making then just learning about it from Al qaeda's magazine inspire. Raising the suspicion that the older brother temelin -- I have. Was trained overseas what did he really do when visiting Russia. I think the most important aspect of the new documents is the Russian link. -- camera -- In other words did he received training of what type training of what individual -- deal with. The document from the terrorist explosive device analytical center says quote. Such construction would likely require previous knowledge of or additional research into circuitry. It appears the bombs were detonated using a forty car remote control. Late Friday night officials took away the boat where the manhunt ended a week ago while temelin had been killed following a carjacking and police shoot out. Officials say his younger brother Joseph -- had been hiding out in this vote until he was discovered and arrested. I am sure that I think -- were not involved in anything. As the mother of the -- I have Brothers -- -- dot insists her sons did not plant bombs at the Boston Marathon. ABC news has learned she and the older son were added to a terror watch list and 2011 at the CIA's request. He's described as a religious militant. -- -- of the Boston Celtics game last night. But team owner of the heroes of the Boston -- -- hospital workers first responders and local leaders. And that little eight year old victim Martin Richard wolf today. It would have been his first Little League game of the season and so that -- wolf honor him today with a number eight. On the field. -- -- -- street -- with such a beautiful smile -- -- can't thank you so much.

This transcript has been automatically generated and may not be 100% accurate.

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