KABUL - At least 35 people, including seven NATO soldiers, were killed in a string of roadside bombs and clashes on Sunday, one of the most violent days in the country for months.

A bomb killed six NATO troops in the east, the coalition said without elaborating, after an insurgent attack in the south killed one foreign soldier.

Twenty-eight Afghan civilians and police were killed in southern Kandahar and Helmand provinces, officials said.

On the same day, major donors in Tokyo pledged $16 billion in development aid for Afghanistan over the next four years as they try to prevent it from sliding back into chaos once most foreign troops have left by the end of 2014.

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