The attack confirms that Boko Haram has entered a new phase, one in which its activities are a truly national problem.

袭击确认博科圣地已经进入了一个新时期。在这个新时期中他们的行动是全国性的问题。

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The Nigerian secret police say that a member of Boko Haram recently came back from Somalia to oversee the attack.

尼日利亚秘密警察表示，波可哈兰一名成员近日从索马里赶回以指导此次袭击。

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But the links have not been proved and little is known about groups such as Boko Haram.

但是，链接关系没有得到证实，并且对博科圣地这类组织有所了解的人甚少。

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But analysts say those tactics are no different from the steps Nigerian officials have consistently used during the country's now nine-year conflict with Boko Haram.

WSJ: Attacks in Nigeria Kill at Least 143

The assault marks a significant escalation in the long-running insurgency Nigeria faces in its predominantly Muslim north, with Boko Haram extremists mounting a coordinated assault on soldiers using military-grade weaponry.

NPR: Officials: At Least 185 Killed In Nigeria Attack

The ambush came after 55 people were reportedly killed in the north-east of Nigeria in co-ordinated attacks by the Boko Haram Islamist militant group.

BBC: Nigeria attack: Nasarawa cult ambush 'kills 30 police'