Attorney General Jeff Sessions will not travel to Kentucky later Friday afternoon, as federal law enforcement works to catch the person or persons involved in the pipe-bomb mailings.

Speaking at at event in Washington, Sessions said that the Justice Department, FBI, Bureau of Alcohol, Tobacco, Firearms and Explosives, U.S. Secret Service, and state and local law enforcement partners “are working tirelessly to follow every lead.”

As of Friday morning, 12 pipe bombs have been mailed to prominent Democratic figures, all of whom have publicly butted heads with President Trump.

“I can assure you that we are dedicating every available resource to this effort. I am receiving frequent updates from Director Wray and his team. And I can tell you this: we will find the person or persons responsible. We will bring them to justice,” said Sessions.

No information about the possible suspect or suspects has yet been made public.

The FBI has reminded the public that the packages containing the possible explosive devices all look similar, and to be alert and call in if something seems suspicious.