Authorities say a Somali national has pleaded guilty in New York to charges of providing material support to terrorist groups.
US Attorney Preet Bharara announced the unsealing Monday of the 2011 plea by Ahmed Abdulkadir Warsame.
According to court documents, Warsame helped train members of the Somalia-based terrorist group al-Shabab from 2007 until April 2011. US authorities say his actions resulted in the death of at least one person, and supported al Qaeda in Yemen.
He was interrogated aboard a Navy ship for two months before being moved to New York.
Authorities say he revealed important intelligence about al Qaeda in Yemen and its relationship with al-Shabab in Somalia.
Al-Shabab controlled much of south-central Somalia from 2006 to mid-2011, when the group was ousted by African Union troops. Since then al-Shabab has been on the run.