[lin_video src=http://eplayer.clipsyndicate.com/embed/player.js?aspect_ratio=16x9&auto_next=1&auto_start=0&div_id=videoplayer-1367208458&height=480&page_count=5&pf_id=9624&show_title=1&va_id=4035723&width=640&windows=2 service=syndicaster width=640 height=480 div_id=videoplayer-1367208458 type=script]BOSTON, Mass. (CNN) - While Federal authorities prepare their case against the surviving Boston Marathon bombing suspect lawmakers are questioning whether the brothers had outside help and whether the attack could have been prevented.
Lawmakers are questioning whether the Boston bombing suspects may have had training from terrorists. The chairman of the House Homeland Security Committee says the Tsarnaev brothers used devices similar to weapons used in Afghanistan, India and Pakistan.
The FBI interviewed Tamerlan Tsarnaev in 2011 after Russian authorities warned he might be a threat. but US officials did not find any reason to suspect him.
Now New York Senator Charles Schumer is calling for congressional hearings to find out exactly what the FBI knew about he suspects and their mother who was also on a watch list.
Schumer faced the media in Times Square. the New York City landmark that officials say the Tsarnaev were targeting next.
But the suspects never made it out of Watertown, Massachusetts. Tamerlan Tsarnaev died in a shootout with police and his brother Dzhokhar is in custody.