The US Role in Yemen: What You Need to Know

The U.S. has been focused on striking al-Qaeda, not the Houthis.

ABC News looks at the complex role the U.S. has played during this bloody war.

U.S. Support of Saudi Arabia is Tested

Shortly after the beginning of the war in January 2015, regional powers rushed in to back the various parties in their internal struggle. Iran began to provide military support to the Houthis. In March, Saudi Arabia and other Gulf nations intervened military to restore the government back to power.

The United States, a longtime ally of Saudi Arabia, quietly began supporting the Saudi-led coalition by providing it with intelligence, weapons sales and air-refueling support.

But the U.S. support of the Saudis has been tested.

A Saudi airstrike on a funeral hall on Saturday may have killed more than 100 civilians alone. A White House statement later said the administration was “deeply disturbed” by the airstrike and announced it was reviewing its limited military support for the coalition, warning that it was “not a blank check.”

The airstrike is the latest in a series of incidents that have raised the Obama administration’s concerns about how the fight against the Houthis is being waged. The Saudi coalition has waged an airstrike campaign that by some estimates has led to 2,000 civilian deaths.

Recently, the U.S. had one military adviser working with the coalition in its military planning in Yemen and has relocated to Bahrain the 45 personnel that had been doing that work at a military base in Saudi Arabia.

The U.S. Targeting of al-Qaeda in Yemen

AQAP, al-Qaeda’s most dangerous affiliate, has taken advantage of the power vacuum in Yemen to rebuild its operations. The group remains committed to taking over control of the country and carrying out terror attacks against the U.S. and other western countries, as well as threatening Saudi Arabia and other Gulf nations.

Other U.S. Interests in Yemen

The U.S. has a strong interest in ensuring the safety of commercial shipping and the 3-to-4 million barrels of oil that travel through the vital waterway each day.

U.S. Navy ships have often been deployed to the waters off Yemen to prevent a military or terrorist threat to the key shipping lane.

A stable government in Yemen is important to Gulf countries wary of Iran’s military support and influence with the Houthis. Gulf countries fear an Iranian military presence in the Arabian Peninsula, a concern that would exacerbate the already tense relationship with Iran because of the threat its nuclear program has posed to the region.

U.S. Hostages

On Sept. 27, the State Department responded to reports of U.S. citizens being held in Houthi-controlled territory, saying they were monitoring the situation and calling on the Houthis to release any U.S. citizens.

In September 2015, two more Americans were freed, along with a British citizen and three Saudis. Those Americans, Scott Darden and Sam Farran, were working to get relief supplies into Yemen and as a security expert, respectively, according to the New York Times.

Three other Americans were freed by the Houthis in November 2015.

U.S. officials say that Yemen still has a small number of Americans in detention.

What’s Next for the U.S. in Yemen?

Three U.S. Navy ships are now in the southern Red Sea following the Houthi’s provocations against American military vessels. They include the destroyers USS Mason and USS Nitze as well as the USS Ponce, an afloat forward staging area that normally houses special operations forces.

The Houthi's actions highlight the long-range missile threat they can pose to neighboring countries and U.S. warships in the waters off Yemen. It is unknown if the missiles were Soviet-era missiles they took over from government forces or if they were new missiles that Saudi Arabia claims have been provided by Iran to the Houthis.

The U.S. has said it will retaliate if its ships are targeted again.

“The United States will respond to any further threat to our ships and commercial traffic, as appropriate, and will continue to maintain our freedom of navigation in the Red Sea, the Bab al-Mandeb, and elsewhere around the world,” Pentagon Press Secretary Peter Cook said in a statement on Wednesday.

If you target our ships, we will respond. My statement on our strikes against radar sites in Yemen https://t.co/RPnXlr8mOz

— Peter Cook (@PentagonPresSec) October 13, 2016

But it’s unlikely the U.S. will seek broader military involvement with the Houthis in Yemen. Yesterday’s U.S. strike was retaliatory in nature and not necessarily indicative of a broader military operation in the country.

The White House seems content with allowing and enabling the Saudis to continue to lead this fight.

“We do share some intelligence with [the Saudis] but the United States does not do targeting for them,” Josh Earnest, White House press secretary, said yesterday.

ABC News' Justin Fishel contributed to this report.

If you target our ships, we will respond. My statement on our strikes against radar sites in Yemen https://t.co/RPnXlr8mOz

But it’s unlikely the U.S. will seek broader military involvement with the Houthis in Yemen. Yesterday’s U.S. strike was retaliatory in nature and not necessarily indicative of a broader military operation in the country.

The White House seems content with allowing and enabling the Saudis to continue to lead this fight.

“We do share some intelligence with [the Saudis] but the United States does not do targeting for them,” Josh Earnest, White House press secretary, said yesterday.

ABC News' Justin Fishel contributed to this report.