Three men have been accused of helping the suspect in the Boston Marathon bombing after the attack took place.
Azamat Tazhayakov and Dias Kadyrbaye from Kazakhstan and US citizen Robel Phillipos have appeared in court in Boston.
Tazhayakov and Kadyrbaye were charged with conspiring to obstruct justice. Phillipos was charged with making false statements.
The charges relate to the time period during which investigators were searching for the main suspect Dzhokhar Tsarnaev, 19, and his brother Tamerlan.
Tamerlan Tsarnaev, 26, was killed during a gunfight with police.
Referring to the arrests and charges, Massachusetts Governor Deval Patrick said: “Based on the briefings that I have had, this should not raise any concerns in anyone’s minds about a continuing threat to the public. This is about getting all the way to the bottom of the story of what happened at the marathon.”
Tazhayakov and Kadyrbaye are accused of throwing away a backpack containing fireworks and a laptop computer belonging to Dzokhar Tsarnaev after the April 15 bombing which killed three people and injured 267.