an unprovoked assault 无正当理由的攻击
"One year ago today, the United States was attacked in an unprovoked assault, " Leach told the delegates.
CNN: Chirac: France owes U.S. a debt
It is being treated by officers as an unprovoked racially aggravated assault.
BBC: Ramanjit Sohi
"Just the media reports I saw looked as if it was somewhat unprovoked so there must be something behind that, and the assault seems extremely vicious, " Key added.
WSJ: New Zealand Cricketer Jesse Ryder Assaulted and in Critical Condition
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