The explosives were planted Thursday outside the house of President Abdrabuh Mansur Hadi, the media arm of Al-Qaedas Yemen branch said in a statement posted on Twitter.
They were intended to be detonated when Ambassador Matthew Tueller left following a roughly hour-long visit to the house in the Yemeni capital Sanaa, it said.
There was no official confirmation of the failed plot.
Yemen is a key US ally in the fight against Al-Qaeda, allowing Washington to conduct a longstanding drone war against the group on its territory, AFP reported.
The United States considers Al-Qaeda in the Arabian Peninsula (AQAP) to be the most dangerous arm of the jihadist organisation.
AQAP was born out of a 2009 merger of its franchises in Al-Qaeda founder Osama bin Ladens native Saudi Arabia and his ancestral homeland in Yemen.
The group has exploited instability in impoverished Yemen since a 2011 uprising overthrew president Ali Abdullah Saleh.
(Uu.H-AK)
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