UPDATED: May 30, 2016, 3:45 PM ET
The White House was put on lockdown Monday afternoon after a woman threw an unknown object over the fence at the North Lawn, according to the Associated Press.
A woman was handcuffed and taken into custody after the object was thrown over the fence, near Pennsylvania Avenue, AP reported. The lockdown ended shortly before 4 p.m. ET, NBC News reported.
The lockdown began shortly after President Obama returned to the White House after a Memorial Day event at Arlington National Cemetery.
CBS White House correspondent Mark Knoller tweeted that a suspect had been detained and Hazmat teams were set to examine the package.
DC Hazmat squad member gearing up to examine container thrown over WH fence onto the North Lawn. Suspect detained. pic.twitter.com/JwFG8qbAKK
— Mark Knoller (@markknoller) May 30, 2016
Hazmat personnel in protective suits examining material thrown over fence onto WH lawn. pic.twitter.com/PFI3nz80Vc
— Mark Knoller (@markknoller) May 30, 2016
NBC also reported on air that law enforcement had set up a portable decontamination unit and were putting on Hazmat suits.
DEVELOPING: Security incident outside the White House due to a suspicious package – @MSNBC https://t.co/PKqcQ9Tpoz
— NBC Nightly News (@NBCNightlyNews) May 30, 2016
Video from witnesses near the scene showed a heavy law enforcement presence.
HazMat crews lined up on 17th for #whitehouse lockdown #breaking pic.twitter.com/caHkiXellP
— Beth Gibson (@MissBethGibson) May 30, 2016
This is a breaking news story. We will provide updates as they are available.