Minnesota state troopers have arrested 41 people after demonstrators blocked rush hour traffic on an interstate in downtown Minneapolis.

Authorities also impounded four vehicles used by the protesters to block traffic on southbound Interstate 35W near University Avenue Wednesday morning. The demonstrators were protesting recent deaths by police.

The demonstrators walked onto a bridge across the Mississippi River and chanted, "I believe that we will win." Troopers arrested protesters on the freeway after about an hour. The interstate reopened shortly after 9:15 a.m.

The protesters come after Philando Castile was fatally shot by a St. Anthony officer during a traffic stop in the Twin Cities suburb of Falcon Heights last week.