The brothers accused of carrying out the Boston bombings planned to carry out an attack in New York.
The FBI is investigating the United States and overseas to determine whether the suspects in the Boston Marathon bombing received training that helped them carry out the attack, the chairman of the US House Homeland Security Committee said.
Republican Michael McCaul spoke a day after US officials disclosed that Russian authorities secretly recorded a telephone conversation in 2011 in which one of the two brothers suspected in the attack, Tamerlan Tsarnaev, vaguely discussed jihad with his mother.
"I think given the level of sophistication of this device, the fact that the pressure cooker is a signature device that goes back to Pakistan, Afghanistan, leads me to believe - and the way they handled these devices and the tradecraft - ... that there was a trainer and the question is where is that trainer or trainers," McCaul told Fox News Sunday.
"Are they overseas in the Chechen region or are they in the United States?" McCaul said.
"In my conversations with the FBI, that's the big question.
They've casted a wide net both overseas and in the United States to find out where this person is. But I think the experts all agree that there is someone who did train these two individuals."
At this point in the investigation, however, Senator Claire McCaskill said there was no evidence that the brothers "were part of a larger organisation, that they were, in fact, part of some kind of terror cell or any kind of direction.''
The Democrat, who's on the Senate Homeland Security and Governmental Affairs Committee, told CBS' "Face the Nation" that "it appears, at this point, based on the evidence, that it's the two of them."
Homemade bombs built from pressure cookers have been a frequent weapon of militants in Afghanistan, India and Pakistan. Al-Qaida's branch in Yemen once published an online manual on how to make one.
Fox News has released an image of what appears to be an exploded backpack at the scene of the Boston bombings. Source: Supplied
Investigators are pursuing other "persons of interest" who may be linked to the deadly bombings.
"There are still persons of interest in the United States that the FBI would like to have conversations with," Congressman Mike Rogers, Republican chairman of the House Intelligence Committee, told US TV's This Week. He declined to provide a number.
Known as "Robin Hood", he was responsible for dozens of attacks and bombings in Dagestan before being killed in December by Russian forces.
Before he was killed, Tamerlan made several videos where he threatened to kill police officers and anyone who helped them, which he posted on his YouTube channel, CNN reports.
After returning to the US from Dagestan, Tamerlan put the videos up in a folder marked "terrorism".
One was a message recorded by Dolgatov, posing in front of a banner in Arabic script.
"I'm warning you," he said in the video. "I'll kill you just like I'll kill them (police officers). Don't become their pawns. If you have brains, you won't want to die leaving behind widows, orphans and crying mothers. We'll destroy you. If you side with the police, you are helping Satan. I'm warning you."
A Russian Interior Ministry official said: "We're looking into whether the two men met or had any contact. It's odd Tsarnaev should post Dolgatov's video. How come he was even aware of his existence?
"We can't rule out that Tsarnaev was introduced to him. Clearly, he was impressed by him if he posted his video. The question is why?"
A senior US official said: "Dolgatov was an obscure figure with local significance for a short period of time - the time Tamerlan was in Dagestan. The fact that Tamerlan viewed his videos online appears to be significant. It just seems to be too much of a coincidence."
The moment of Dzhokhar Tsarnaev's arrest aftera dramatic shootout with police. Picture: via Twitter/Imgur Source: No Source
A new government document obtained by ABC news has raised suspicions about Tamerlan and his visits back to Russia.
Speculation surrounds Tamerlan and the possibility that he was being trained in Russia.
The document says: "Such construction would likely require previous knowledge of or additional research into circuitry."
With the Boston marathon bombing suspect in a prison hospital, investigators are pushing forward and abroad to piece together the myriad details of a plot that killed three people and injured more than 260.
Boston firefighters, right, talk with FBI agents and a crime scene photographer at the scene of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, in Boston, Tuesday, April 16, 2013. (AP Photo/Charles Krupa)
Recently, it was revealed that Russian authorities secretly recorded a telephone conversation in 2011 in which one of the Boston bombing suspects vaguely discussed jihad with his mother, officials say.
In another conversation, the mother of now-dead bombing suspect Tamerlan Tsarnaev was recorded talking to someone in southern Russia who is under FBI investigation in an unrelated case.
Had the conversations been revealed earlier, they might have been enough evidence for the FBI to initiate a more thorough investigation of the Tsarnaev family.
Russian authorities told the FBI only that they had concerns that Tamerlan and his mother were religious extremists. With no additional information, the FBI conducted a limited inquiry and closed the case in June 2011.
Two years later, authorities say Tamerlan and his brother, Dzhohkar, detonated two homemade bombs near the finish line of the Boston Marathon, killing three and injuring more than 260.
Tamerlan was killed in a police shootout and Dzhohkar is under arrest.
How did Boston terror suspect Tamerlan Tsarnaev - whose mother was also on a terror database - slip through the cracks, despite warning signs?
Tamerlan Tsarnaev, suspected mastermind of the Boston bombings. Picture: Splash Australia Source: The Sunday Telegraph
In the past week, Russian authorities turned over to the United States information it had on 26-year-old Tamerlan and his mother, Zubeidat Tsarnaeva, ethnic Chechens who emigrated from southern Russia to the Boston area about 11 years ago.
In early 2011, the Russian FSB internal security service intercepted a conversation between Tamerlan and his mother vaguely discussing jihad, according to US officials who spoke on condition of anonymity.
The mother of the brothers suspected of carrying out the Boston bombings has lashed out at US authorities.
The two discussed the possibility of Tamerlan going to Palestine, but he told his mother he didn't speak the language there, according to the officials, who reviewed the information Russia shared with the US.
In a second call, Zubeidat Tsarnaeva spoke with a man in the Caucasus region of Russia who was under FBI investigation.
Congressman Mike Rogers, Republican chairman of the House Intelligence Committee, said on US TV's This Week show that there are still "persons of interest" the FBI would like to speak with in the USA. Picture: AP Photo/J. Scott Applewhite
The mother of the two Boston bombing suspects, Zubeidat Tsarnaeva, with the suspects' father Anzor Tsarnaev, left, speaks at a news conference in Makhachkala, the southern Russian province of Dagestan, on Thursday. Picture: AP Source: AP
Nothing in the conversation suggested a plot inside the US, officials said.
It was not immediately clear why Russian authorities didn't share more information at the time.
Zubeidat Tsarnaeva has denied that she or her sons were involved in terrorism. She believes her sons have been framed by US authorities.
The sons' father has been hospitalised, preventing his departure for the United States, he says.
Anzor Tsarnaev told Ria Novosti news agency he had left Makhachkala, capital of the Russian republic of Dagestan, for Moscow to catch a flight to the United States but had to be hospitalised due to a sudden rise in his blood pressure.
Bombing suspects Dzhokhar Tsarnaev and TamerlanTsarnaev pictured at the Boston Marathon. Picture: AP Photo/FBI
Speaking from his home in Makhachkala in Russia's south, the father of the Tsarnaev brothers suspected of carrying out the Boston Marathon attack says his children were framed. Deborah Gembara reports.
"I am in hospital but not in Moscow," Mr Tsarnaev said, refusing to say where he was.
"Due to the illness I've decided to put off for the moment my journey to the United States."
The parents of the Boston Marathon bombing suspects have retreated to a village in southern Russia to shelter from the spotlight and abandoned plans for now to travel to the United States.
Anzor Tsarnaev said he believed he would not be allowed to see his surviving son Dzhokhar.
"Unfortunately I can't help my child in any way. I am in touch with Dzhokhar's and my own lawyers. They told me they would let me know (what to do)," Tsarnaev said in an interview in the village where he relocated with the suspects' mother.
He agreed to the face-to-face meeting on condition that the village's location in the North Caucasus, a string of mainly Muslim provinces in southern Russia, not be disclosed.
The mother of the Boston bomb suspects says it is all a set-up and her elder son was controlled by the FBI for years. Lily Grimes reports.
FBI crime scene investigators look for evidence just off Boylston Street near Berkeley Street April 17, 2013 in Boston, Massachusetts. Darren McCollester/Getty Images/AFP
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