The package was addressed to Sen. Cory Booker, D-N.J., and discovered at a postal facility in Royal Palm Beach, Florida, according to officials.

On Thursday, investigators said they believed some of the packages may have passed through the U.S. mail sorting facility in Opa-locka, Florida. The packages listed Rep. Debbie Wasserman Schultz’s address — in Sunrise, Florida — as the return address. Sunrise is less than 20 miles north of Opa-locka. Royal Palm Beach is about 40 miles north of Sunrise.

The ten previous packages, all of which contained pipe bombs, have been addressed to former Vice President Joe Biden, actor Robert De Niro, Rep. Maxine Waters, D-Calif., former Attorney General Eric Holder, former CIA Director John Brennan, former President Barack Obama and former Secretary of State Hillary Clinton.