A 56-year-old man has been arrested in Florida in connection with a mail-bombing campaign aimed at critics of President Donald Trump.
US officials named the man as Cesar Sayoc, saying that more arrests could follow.
Trump said the acts were “despicable and have no place in our country”, and promised “swift and certain justice”.
Twelve items have been sent in recent days to figures like ex-president Barack Obama and actor Robert de Niro.
The latest two were found in Florida and New York City on Friday.
The incidents come less than two weeks before the US mid-term elections, with politics highly polarised.
Media reports say Sayoc was arrested at an auto parts shop in the city of Plantation, Florida.
US officials say he is the principal suspect, and that DNA evidence was used to track him down.
He reportedly has ties to New York and a criminal history. Court records show he filed for bankruptcy in 2012.
