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U.S. officials are investigating whether the Boston Marathon bombing suspects acted alone, a scenario some in Congress say is highly unlikely.
"It stretches the imagination to think that these two kids went online, watched a couple videos, and then put together some very sophisticated bombs," said Rep. Jason Chaffetz, R-Utah, member of the House Homeland Security Committee.
"That leads us to believe that there were others involved, that somehow these two kids went awry, and they got trained, they got information, they were radicalized, and that's what the officials are diving deep into now," said Chaffetz.
Chaffetz argued that the Boston terrorist attacks are an example of why the U.S. needs a better immigration system, even though the gaps in this case appear to be more strongly rooted in intelligence issues.
"I think it really has to go back to Homeland Security," says Chaffetz. One of the things that needs to be closely examined, he said, is asylum.
From the moment one neighbor met Tamerlan Tsarnaev, the Boston bombing suspect was ranting about the Koran and American foreign policy.
"He said that the bible was a cheap copy of the Koran. He said that the American government used it as an excuse to invade different countries. He mentioned that the American government was still a colonial power, wanting to colonize Africa and the Middle East," said Albrecht Ammon, a neighbor who lived in the same building as the Tsarnaevs.
Ammon said Tsarnaev claimed most casualties in Iraq and Afghanistan were innocent bystanders, gunned down by American people, prompting the neighbor to ask about suicide bombers that kill innocent people.
"He said that not all Muslims are like that. And Islam is all about peace and love," said Ammon.