For more reading on Al-Muhajiroun, click here and here.
On July 21, 2015, the al-Qaeda and al-Shabaab aligned group Al-Muhajiroun-Emigrants of East Africa released the second edition of "Amka", an online magazine detailing their latest goals, ideological messages, and exploits. Al-Muhajiroun is a relatively new group which emerged earlier this year in Kenya, with the intention of operating in the East African region. While they haven't claimed formal responsibility for any attacks yet, they seem to be Swahili-oriented and appear to have several members of Western origin.
Entitled "East Africa: Jihad's Homecoming", the magazine opens with an introduction from Abu Salim Al-Kenyi, the editor. Al-Kenyi states that while there were certain difficulties in publishing the issue, "The Ummah [nation] in East Africa responded with great enthusiasm and passion, in particular the lions in Mahenge and Mombasa." Mahenge is both an area and town located in Ulanga District, Tanzania. Mombasa in particular has been the site of frequent terrorist attacks in Kenya since 2008. While there are no recorded attacks having occurred in Mehenge since the first publication of Amka, it is possible that Al-Kenyi's statement refers to recruitment efforts in both areas. Al-Kenyi then goes onto to claim that al-Shabaab is on the cusp of victory in Somalia. While there have certainly been many high-profile attacks recently, it appears that for now the situation remains in AMISOM's favor.