Hundreds of newly released court documents in the case of Boston Marathon bomber Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) shed little new light on the 2013 attack, but hundreds more could stay secret for years.

The 22-year-old Tsaranev was convicted last year and sentenced to death in the bombings, which killed three people and injured more than 260.

More than 300 additional filings and exhibits remain sealed because prosecutors or Tsarnaev's lawyers argue that they should not yet be made public. This list of disputed filings is believed to include statements Tsarnaev made to authorities after his arrest and documents related to a state investigation into a triple murder that Tsarnaev's brother was suspected in.

Legal analysts say some documents could remain sealed until Tsarnaev exhausts his appeals.