Bismarck Police closed off the streets around the City Federal Building Thursday evening while investigating a suspicious package.Police reported they blocked off E Rosser Ave and N 2nd St; E Thayer Ave and N 3rd St; E Ave A and N 3rd St; N 4th St and E Rosser Ave.

Authorities gave the "all clear" around 4;30PM and traffic resumed.

The story is developing; check back periodically.

[Source: Bismarck Police Facebook site]