Alva Review-Courier -

WARSAW, Poland (AP) — The Islamic State group has claimed responsibility for an attack on a suburban Moscow concert hall that killed at least 133 people, the most deadly attack in Russia in years. Though the U.S. says it has evidence backing up the jihadists' claim, that didn't stop Moscow and Kyiv from pointing the finger at each other Saturday as the war in Ukraine rages on.

Much remains unknown about the Friday night attack, including whether it related to a security alert the U.S. Embassy in Moscow issued two weeks earlier and whether it signals a resurgence of the group in the West.

Russi...