The White House has been placed into lockdown mode after a suspicious package was found on the grounds.

Fire trucks and a decontamination unit are reportedly on site, according to MSNBC. Emergency services are described as wearing Hazmat protective gear. https://twitter.com/MSNBC/status/737339466495332352 The lockdown of the north side of the building falls on a US public holiday - Memorial Day - and it occurred while President Barack Obama was home. https://twitter.com/newszilla/status/737341997501927425 https://twitter.com/JimmCarr/status/737339539291672576 Initial reports - so far unconfirmed - said that the suspicious package was tossed over the fence of the White House. https://twitter.com/SkyNewsBreak/status/737338007074770945 Less than two weeks ago, the White House was locked down after a man approached the building's security staff with a firearm. He was shot and detained during the encounter. (Cover image of White House lockdown after shooting on May 20. Credit: Alex Wong/Getty).