YEMEN - ISIS has infiltrated Yemen, a country already flooded with terrorist groups. The Syria-based terror group, known for its extreme brutality and shockingly successful recruitment of outsiders, has gained a tentative foothold alongside the Al Qaeda forces already present.

Al Qaeda remains the dominant presence, but the competition for recruits and support may sway in favor of the more financially-appealing ISIS. This friction between the two groups can spell increased trouble for civilians in Yemen and elsewhere. In-country fighting and instability has escalated, as is evidenced by a gun battle between the two groups last month and White House analysts fear the competition will become a race to see who can hit US soil first and hardest. (Source: CNN)

Another key player in the Yemeni crisis is the Houthis, a rebel group demanding greater control of what they claim is a western-controlled government and protesting unequal distribution of resources. They belong to the Zaidi branch of Shia Islam, also known as Fivers, a sect of Islam almost exclusively present in Yemen. They are from the Shi'ite minority similar to the Twelvers found mainly in Iraq, Lebanon and Iran and are known for being most similar to Sunni Muslims in matters of religious law and rulings. They do however, believe in the concept of an Imamate as being essential to their religion, which makes them distinct from Sunnis. (Global Security.org, "Zaydi Islam”, by John Pike)

Pressure from Houthi fighters resulted in the resignation of President Abdrabbuh Mansour Hadi. His departure triggered thousands of Yemeni citizens to counter-protest the Houthi actions. (Source: BBC)

Yemen, although among the world's poorest countries, has strategic political and geographical importance. The terror activity poses a danger to the U.S., who is often the target for attacks. In addition, it is a gateway for foreign fighters to go to Afghanistan, Iraq and Syria, providing ample recruiting opportunities for ISIS and other terror groups. The U.S. government had found allies in Yemen officials and was working with their government to develop counter-terrorism methods. Now that the shaky government has been obliterated by rebels and terrorist groups compete for dominance and destruction, the future of Yemen is unclear.