White powder mailed to Barack Obama's office building in Washington DC

Washington, D.C. authorities quickly reacted Tuesday after a white substance was discovered in mail sent to the offices of former President Barack Obama.

It's unclear if Obama was inside, but the New York Post reported he has leased space at the building, owned by the nonprofit World Wildlife Fund, since leaving office in January 2017. Nobody was injured, and building employees remained in place as officials responded. Obama and his family live nearby.

On Monday morning at around 10:00 a.m., Vanessa Trump opened the package, which had been sent to Trump Jr.'s Manhattan apartment. That powder was also found to be non-hazardous.

On Monday, the daughter-in-law of President Donald Trump, Vanessa Trump, was hospitalized in NY after opening a letter containing a white powdery substance.

Tests found that the substance was corn starch. Sources told FOX 5 New York's Linda Schmidt that the envelope had a Boston postmark.

It is not clear if the former President was inside the office, that he has used to conduct business since he left the White House, at the time of the delivery.

The building - the headquarters of owners World Wildlife Fund (WWF) - has been cordoned off and the area is on lockdown until police give the all clear.

Vanessa Coleman