The United States authorities on Saturday intercepted an envelope posted to the White House which contained the lethal substance ricin.
According to a report published by the different sections of United States media, the letter was addressed to President Donald Trump. It appears to have been sent from Canada, and officials have identified a woman as a suspect.
The letter was stopped at the final off-site government mail center before it arrived at the White House in Washington.
“The FBI and our US Secret Service and US Postal Inspection Service partners are investigating a suspicious letter received at a US government mail facility,” the FBI said in a statement, according to media reports.
“At this time, there is no known threat to public safety,” the statement further said.
However, similar envelopes were sent to the law enforcement agencies in Texas, including a detention facility center.
The Joint Terrorism Task Force in Washington is taking charge of the investigation with help from New York and the Royal Canadian Mounted Police (RCMP).
The investigators have said that no links have been found between the poisonous letter and any international terrorist organizations. However, they declined to respond on what basis they had pointed to the female suspect. They said the investigations are still in its early stages and nothing is confirmed yet.
This is not the first time the US White house resident has been attacked by ricin, as former President Barack Obama was also the target of a ricin attack.
In 2013, actor Shannon Richardson was sentenced to 18 years in federal prison for mailing letter laced with ricin to Obama and Michael Bloomberg, the then-mayor of New York.