Two explosive devices were found in mail sent to the offices of former President of US Barack Obama and former Secretary of State Hillary Clinton, the US Secret Service said on Wednesday.

In a statement, the Secret Service said it "has intercepted two suspicious packages addressed to Secret Service protectees," who were identified as Mrs. Clinton and Mr. Obama.

Earlier. a US official informed that a "functional explosive device" was found at Hillary and Bill Clinton's suburban New York home.

The official says investigators believe the explosives are linked to one found Monday at the compound of liberal billionaire George Soros.

The device was discovered early Wednesday morning at the Clinton's home in Chappaqua, New York.

(With inputs from NYT and AP)