Tens of thousands of protesters took to the streets across America again Sunday, with peaceful demonstrations against police killings of black people overshadowed by unrest that quickly ravaged parts of cities from Pennsylvania to California.

Demonstrators marched, stopped traffic and in some cases lashed out violently at police as protests erupted Friday in dozens of U.S. cities following the killing of George Floyd after a white officer pressed a knee into his neck while taking him into custody in Minnesota.