Ukraine bus attack kills 10 as airport battle worsens

KIEV (Reuters) - A passenger bus came under heavy fire in eastern Ukraine on Tuesday, killing at least 10 people, Ukrainian authorities said, and fighting intensified around the international airport in the city of Donetsk as separatists tried to oust government forces.

The latest violence flared after Russia, Ukraine, France and Germany scrapped plans for a summit in Kazakhstan this week because of the failure to implement a four-month-old ceasefire agreement.