On Monday, FBI agents visited the Rhode Island family home of Katherine Russell.
She is the widow of Boston bombing suspect Tamerlan Tsarnaev.
This is video of agents entering the home in North Kingstown, along with Russell's attorneys.
Authorities are trying to determine what the 24-year-old knew about the deadly plot, allegedly masterminded by her husband.
Her attorney tells CNN she did not know anything about it.
Russell's family says she last saw her husband hours before he died in a gun battle with police.
Her attorney said in a statement that she is "Doing everything she can to assist with the investigation.