On September 19, local time, according to relevant US law enforcement officials, earlier this week, law enforcement officers intercepted a package sent to President Trump that contained ricin.

  All mail sent to the White House will be sorted and screened elsewhere before reaching the White House.

Law enforcement officers confirmed the presence of ricin after conducting two tests.

The FBI and the Secret Service are investigating the matter.

  Ricin is a highly toxic compound extracted from castor beans and has been used for intimidation and other purposes.

It can be used in powder, granule, mist or acid form.

If ingested, it can cause nausea, vomiting, and bleeding in the stomach and intestines, and then lead to liver, spleen and kidney failure, and death due to the collapse of the circulatory system.

(CCTV reporter Liu Xiaoqian)