"Since the date of our request, there have been numerous mass attacks, including Virginia Beach, VA; Gilroy, CA; El, Paso, TX; and Dayton, OH. ... These continued mass attacks make it clear that the federal government has more work to do in preventing domestic terrorism," the two senators wrote to Barr and Wray in separate letters, which were obtained by The Hill ahead of their release.

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They added that they have concerns that the FBI and DOJ have "failed to accurately track data on domestic terrorism and that federal law enforcement has been slow to respond to changing domestic threats."

"In the wake of such senseless tragedy, we ask that you immediately respond to our May 8, 2019 letter and provide the committee with the requested documents to aid in its oversight work," Johnson and Peters wrote in their letters.

Top senators on the Homeland Security and Governmental Affairs Committee are doubling down on a request for details from the FBI and Department of Justice (DOJ) about how they handle "all forms of domestic terrorism" after the weekend's two mass shootings.The letters come after a gunman killed 22 people and wounded dozens more in an attack at a Walmart in El Paso, Texas, on Saturday. Less than a day later, at least nine people were killed and more than two dozen were injured in a Dayton, Ohio, shooting. The two shootings are not believed to be linked.