The White House was reportedly locked down over security alert after a man allegedly threw firecrackers over the outer fence.
This came hours after the Navy Yard shooting in Washington that killed 13 people, and a Secret Service source confirmed that the alleged man set off firecrackers dismissing the earlier reports that gun shots were fired.
According to news.com.au, witnesses testified that Secret Service officers tackled a man outside the gate of the White House.
The Lafayette Park, opposite to the White House, was later cordoned off that is normally thronged by tourists in the early evening in late summer.
The report said that the senate officials decided to seal the north side of the Capitol building amid ongoing uncertainty about the possibility that another gunman involved in the carnage at the Washington Navy Yard may still be at large.
