WASHINGTON: A 56-year-old man has been arrested in Florida in connection with a mail-bombing campaign aimed at critics of US President Donald Trump .
US officials named the man as Cesar Sayoc, saying that more arrests could follow.
President Donuld 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 including 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 a vehicle parts shop in the city of Plantation, Florida.
Law enforcement agencies said Sayoc lives in Aventura, Florida. He reportedly has ties to New York and is a registered Republican.
In 2002, he was arrested for making a bomb threat in Miami-Dade County, and received one year of probation for the charge.
Sayoc has a criminal record dating back to 1991 in Broward County, according to clerk records. He was arrested, aged 29, on a theft charge. He has also faced charges of fraud and battery.
Court records show Sayoc filed for bankruptcy in 2012 while he was living with his mother. A handwritten note in his bankruptcy report reads: "Lives w/mom. Has no furniture."
In 1980, he spent three semesters as a student at Brevard College in North Carolina, a university spokeswoman told BBC News. He did not graduate, the spokeswoman added.
US officials say that DNA evidence was used to track him down.