At least 20 people were killed in Russia's missile attack on a crowded Ukrainian mall

Ukrainian State Emergency Service firefighters work to take away debris at a shopping center burned after a rocket attack in Kremenchuk, Ukraine, Tuesday. (Efrem Lukatsky/AP)

KYIV, Ukraine — The death toll has climbed to 20 people in a Russian strike on a crowded shopping mall in the central Ukrainian region of Poltava, a Ukrainian presidential adviser said.

Authorities say up to 1,000 people were inside the mall late afternoon on Monday when two missiles struck the Amstor shopping center in the city of Kremenchuk.