US Secret. Service says a letter addressed to President Obama containing a suspicious substance has been intercepted at a Postal Screening centre in Maryland.
A letter is intercepted at a remote facility a day after another letter sent to a US senator is confirmed to contain ricin.
A letter with a “suspicious substance” has been sent to President Barack Obama, says the US Secret Service.
Secret Service spokesman Ed Donovan says the letter was intercepted at a facility away from the White House. He says the letter was received Tuesday.
The development comes a day after lawmakers said a separate letter was mailed to a US senator that tested positive for poisonous ricin. Another senator said police have a suspect in mind.
Tensions have been high in Washington and across the US since the deadly bombings on Monday at the Boston Marathon that killed three people and injured more than 170.