Story highlights AQAP leader reportedly praises lone-wolf attacks on West, saying "America is first"

An expert considers AQAP to be the most dangerous al Qaeda branch to the United States

(CNN) Al Qaeda's branch in Yemen, which officials have called the terror group's most dangerous affiliate, has issued two threatening new communiques praising recent lone-wolf style attacks against the West and calling for more of them.

"We urge you to strike America in its own home and beyond," says a letter attributed to Ibrahim al-Asiri, the master bomb-maker with al Qaeda in the Arabian Peninsula (AQAP).

The letter, according to a translation by SITE Intelligence Group, states, "America is first."

CNN is unable to independently verify that Asiri himself wrote it, but the letter has drawn the attention of terror trackers such as MEMRI, Flashpoint and SITE.

Another senior AQAP leader, Khaled Batarfi, released a video, which appears to have been shot in a studio, carrying a similar statement. Batarfi does not attribute the message of the video to Asiri, despite its similarities to the letter.

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