The investigation into the Boston marathon bombings took its most significant step forward when the Federal Bureau of Investigation released surveillance pictures of two suspects it said it wanted to question.
波士顿马拉松爆炸案调查取得了突破性进展，美国联邦调查局(FBI)公布了两名嫌犯的监控照片，FBI表示想要审讯这两名嫌犯。
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