More information about the arrests that happened this morning in Boston has been released, and it doesn't look like this was a broader terrorist network or anything. Dashiell Bennett at The Atlantic explains:

The Boston Police Department announced via Twitter this morning that three new suspects—two students from Kazakstan and one United States citizen—have been placed under arrest in the Boston Marathon bombing case. The three men, all 19-years-old, are identified as Dias Kadyrbayev, Azamat Tazhayakov, and Robel Phillipos. The trio will appear in court on Wednesday to face charges of conspiracy to obstruct justice, after allegedly removing evidence from Tsarnaev's apartment while he was being hunted by the FBI.

BuzzFeed has more information, in a convenient listicle format.