BOSTON - The FBI continues its intense investigation of the widow of the older Boston Marathon bombing suspect.

Agents have been searching the Cambridge, Mass. apartment where Katherine Russell lived with Tamerlan Tsarnaev.

Last week, sources close to the investigation said police found explosive residue on the kitchen table, kitchen sink and bathtub.

Russell has been staying with her parents in Rhode Island since the April 15 marathon bombing.

Agents say they have been following her every movement whenever she leaves that home.

Meanwhile, a funeral director in Massachusets says he's having trouble finding a burial plot for Tsarnaev.

Tsarnaev’s autopsy shows the marathon bombing suspect died after a shootout with police and from blunt trauma after being run over by his younger brother.

Most local cemeteries want nothing to do with Tsarnaev.

The funeral home says it will ask the city of Cambridge to provide a plot.

If officials say no, they'll have to ask state officials for help.