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The development came amid a nationwide manhunt for the person responsible for at least 13 explosive devices addressed to prominent Democrats including former President Barack Obama, former Vice-President Joe Biden and Hillary Clinton. The case continued widening Friday even as Sayoc was detained, as investigators in California scrutinized a similar package sent to Democratic Sen. Kamala Harris, her office said.

In Washington, Attorney General Jeff Sessions cautioned that Sayoc had only been charged, not convicted. But he said, “Let this be a lesson to anyone regardless of their political beliefs that we will bring the full force of law against anyone who attempts to use threats, intimidation and outright violence to further an agenda. We will find you, we will prosecute you to the fullest extent of the law.”

In Florida, law enforcement officers were seen on television examining a white van, its windows covered with an assortment of stickers, outside the Plantation auto parts store. Authorities covered the vehicle with a blue tarp and took it away on the back of a flatbed truck.

The stickers included images of Trump, American flags and what appeared to be logos of the Republican National Committee and CNN, though the writing surrounding those images was unclear.

Photo by Jose Romero / WPLG / AFP / Getty Images

Trump, after Sayoc was apprehended, declared that “we must never allow political violence take root in America” and Americans “must unify.” As in comments earlier in the week, he did not mention that the package recipients were all Democrats or officials in Obama’s administration, in addition to CNN, a news network he criticizes almost daily.