The United States is to seek a rare federal death penalty for Dzhokhar after three people were killed and about 260 wounded on April 15 last year when two bombs made of explosives-packed pressure cookers went off near the finish line of the Boston marathon.
Dzhokhar, then 19, and his 26-year-old brother Tamerlan were cornered by police after a four-day manhunt. Tamerlan died after an exchange of fire with police and Dzhokhar was wounded.
"We seek this information based on our belief that these contacts were among the precipitating events for Tamerlan's actions during the week of April 15, 2014, and thus material to the defense case in mitigation," the filings say.
The FBI "questioned Tamerlan about his Internet searches, and asked him to be an informant, reporting on the Chechen and Muslim community.
"We further have reason to believe that Tamerlan misinterpreted the visits and discussions with the FBI as pressure and that they amounted to a stressor that increased his paranoia and distress."
The defence is attempting to save Dzhokhar from the death penalty -- if he is found guilty -- by arguing that Tamerlan was the main instigator behind the attack.
Dzhokhar Tsarnaev's trial begins in November.
The one-time student from a Chechen Muslim family has pleaded not guilty to 30 federal charges related to the bombings, including 17 serious charges that can carry sentences of death or life in prison.
These charges include using a weapon of mass destruction resulting in death, as well as conspiracy and bombing of a place of public use resulting in death, and carjacking.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
