This story was originally published by the WND News Center.

The White House North Lawn is back open after a 30-minute lockdown Tuesday as someone threw an object over the fence, prompting security to order news reporters inside the president's residence for their own protection.

It turns out the object thrown over the fence may have been a cell phone.

White House correspondent Kimberly Halkett cited White House Press Secretary Karoline Leavitt saying: "Someone (presumably a tourist) threw their phone over the fence (of the White House)."

The Daily Mail reports: "The Secret Service quickly called a lockdown of the park and White House and closed off Pennsylvania Avenue.

"Agents ushered press standing outside into the briefing room without providing further details at around 11:30 a.m. ET.

"The Secret Service declared an all-clear order roughly 30 minutes later, allowing reporters back onto the North Lawn."

Numerous reporters posted video clips from both outside the White House and inside the James Brady Briefing Room to document the confusion as they were initially left in the dark as to the nature of the situation.

The incident comes just days after the one-year anniversary of President Donald Trump's assassination attempt in Butler, Pennsylvania.