Secret service agents confirmed they were investigating the discovery and that several roads around the White House had been sealed off.
They said the package was found at Pennsylvania Avenue and 15th Street at the heart of the Capitol.
Washington has been on high alert since the inauguration of controversial president Donald Trump.
Protests against some of his unpopular policy decisions have been taking place in the US and around the world since he was sworn in.
Police have sealed off parts of Washington
Secret service agents confirmed they were investigating a suspicious packageOriginal Article