FBI agents visited the family home of suspected Boston Marathon bomber widow Katherine Russell on Monday after female DNA was found on at least one of the bombs in the deadly blast, Breaking Celebrity News is reporting.

The federal investigators were spotted leaving the Kingstown, Rhode Island, house where Tamerlan Tsarnaev's widow has been holed up since his death in a shootout with police on April 19, and left at around 2:15 p.m. ET carrying a number of bags, including one that was clear plastic with "DNA" stamped on the side.

An FBI official familiar with the case said the visit was the culmination of days of negotiations, reported the Wall Street Journal, but cautioned that there could be multiple explanations for why the DNA of someone other than the two bombing suspects -- Tamerlan, 26, and his 19-year–old brother, Dzhokhar Tsarnaev -- could have been found on remnants of the exploded devices, such as a store clerk handling materials used in the bombs or a stray hair.

While there have been federal agents keeping watch on the house 24/7, "That is the first time they have entered the house with the intention of looking for something since this all started. The door is still shut, the family are not coming out," neighbor Karen Mather exclusively told Breaking Celebrity News.

Following the lengthy search, the officers "followed Katherine and she got into her white car. We assume she went to her lawyer's office," said Mather. "We still don't know what is going on. We are just witnessing everything as it unfolds."

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