Wave of bomb letters is a political threat to US

The FBI has intercepted bomb letters that were sent to US ex-president Barack Obama, Bill and Hillary Clinton, and news channel CNN.

At the home of former presidential candidate Hillary and former president Bill Clinton in Chappaqua, New York State, an explosive was found on Wednesday, reported The New York Times. A moment later, in Washington, a suspect package was also intercepted that had been sent to American ex-president Barack Obama.