据官员透露，美国最大购物中心的一起计划枪击袭击在一名青少年因试图购买突击步枪被捕后得以挫败。
A planned gun attack on the largest mall in the US was prevented after a teenager was arrested trying to buy an assault rifle, according to officials.
18岁的谢赫敦·阿卜杜拉希·穆罕默德（Sheikhdoon Abdullahi Mohamud）周二在明尼苏达州里奇菲尔德被拘留，距离他据称的目标——布卢明顿的美国购物中心（Mall of America）有数英里。
Sheikhdoon Abdullahi Mohamud, 18, was detained on Tuesday in Richfield, Minnesota several miles away from his alleged target, the Mall of America in Bloomington.
特工称，这名青少年已接受近两年调查，期间他一直在与一名机密线人通讯，随后特工向他出售了一支步枪和弹药，并当场将其逮捕。
Agents said the teen had been under investigation for nearly two years, during which he was messaging a confidential informant, before they sold him a rifle and ammunition, and arrested him on the spot.
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在交易过程中，穆罕默德据称支付了600美元（450英镑）购买一把AK-47和200发子弹，将钱交给了一名冒充“伊斯兰国”（ISIS）成员的FBI卧底雇员。
During the exchange, Mohamud allegedly paid $600 (£450) for an AK-47 and 200 rounds of ammunition, giving the money to an undercover FBI employee posing as a member of ISIS.
明尼苏达州联邦首席检察官丹尼尔·罗森（Daniel Rosen）称穆罕默德是一名“需要被监控的激进化青年”。
Attorney Daniel Rosen, the top federal prosecutor in Minnesota, called Mohamud a "radicalised young man who needed to be watched".
丹尼尔·罗森，明尼苏达联邦地区检察官。 话说，可能是30到60人”。
Daniel Rosen, US attorney for the District of Minnesota. Pic: AP Praising the FBI investigation, he said agents "were able to detect a threat, and disrupt it, before the defendant carried out his intention to kill, in his words, maybe 30 to 60 people".