Q&A: Possible FBI failings in Boston bombing
- Published
Tamerlan Tsarnaev was questioned by the FBI in 2011
Senior Federal Bureau of Investigation (FBI) officials are to face tough questions in Congress on Tuesday about the Boston Marathon bombing, in which three people died and scores were injured.
Several US lawmakers have raised concerns that the US security agency failed to identify and follow up information about the threat posed by Tamerlan Tsarnaev.
The 26-year-old was killed last week in a shootout with police. His wounded brother Dzhokhar, 19, has been charged over the bombings.
What did the FBI learn when it interviewed Tamerlan Tsarnaev?
Why was no further action taken after the 2011 investigation?
Why were the authorities unaware of his visit to Russia?
Why was he not identified as a threat based on links to radical websites?