Efforts to secure their release have so far failed, though officials say the U.S. citizens are not hostages.
A federal jury rejected arguments that Dzhokhar Tsarnaev’s older brother was the sole mastermind.
The death penalty is on the table as the jury continues deliberations of Dzhokhar Tsarnaev’s fate.
In closing arguments in the trial of Dzhokhar Tsarnaev, prosecutors stressed the depravity of the attack.
Charles Harvey Eccleston allegedly offered to infiltrate U.S. computers for nuclear data to sell abroad.
Director James Comey said there was no indication Elton Simpson was planning an attack.
Investigators say there are so far no indications that the group directed the plot against a cartoon contest lampooning Islamic prophet.
A judge later lessened the charge against Elton Simpson to lying to agents. Simpson and his roommate were killed by police Sunday after opening fire on an exhibit that lampooned the prophet Muhammad.
The man authorities believe opened fire outside an inflammatory art exhibition had been arrested years earlier.
The proposed legislation follows criticism of the government’s handling of recent hostage situations.