The New York Police Department (NYPD) are investigating a suspicious piece of mail containing a white powder that was sent on Thursday to Eric Trump, the middle son of Republican presidential frontrunner Donald Trump.
NYPD sources told NBC News that initial tests on the powder found that it was non-hazardous, although initially there were concerns it may have been anthrax.
Shortly before 9:30 p.m. local time the envelope was received at Eric Trump's residence at Trump Parc East, an upscale residential building just off the southern part of Central Park in Manhattan.
Members of Eric Trump's security team alerted the authorities. According to the police, the letter was postmarked in Massachusetts.
"At approximately 7:15 p.m., the NYPD responded to a residential building at 100 Central Park South to investigate a report of a suspicious letter received by a tenant. The letter has been removed and is being examined by law enforcement authorities. No injuries have been reported in connection with this incident," the police told ABC News.
As he moves towards securing the Republican nomination, Donald Trump has also caused a backlash with his at times controversial comments. Opposition to his campaign has even been seen by senior GOP leaders, who reportedly are considering an independent run to try and thwart him.
Aside from the white powder, other acts of intimidation targeting Trump are set to include the hacker group Anonymous, which is trying to organize an April 1 cyber war targeting his websites.
Another sign of the reaction against Trump was seen in a rating of global security risks by the London-based research group Economist Intelligence Unit (EIU), which this week posited that him winning the presidency would be the sixth highest risk to the world – at the same level as jihadi terrorism destabilizing the economy.