Seventy-four people were arrested at a Black Lives Matter protest in Rochester, N.Y., last night as protests against police shootings continued around the country.

The protest took place in reaction to video of officer-involved shootings in Baton Rouge, La., and a Minneapolis suburb that have dominated national attention and — along with an ambush of police officers at a protest in Dallas that left five dead and seven wounded — compelled President Obama to speak about domestic racial tensions while traveling in Poland for a NATO summit.