Yemen foiled an al Qaeda plot to capture oil and gas facilities and seize two key southern ports early this week, a spokesman for the prime minister said Wednesday.
However, another Yemeni government official said it did not appear that the plot was the terror threat that prompted the United States on Tuesday to urge Americans to leave the country.
That official, who was not authorized to speak to the media, downplayed the report of the plot disruption, saying that "these are ongoing threats to oil and gas installations in Yemen."
Al Qaeda in the Arabian Peninsula "has neither the manpower nor the capabilities to capture ports or seize pipelines," the official said. "Security precautions are always in place regarding all oil installations and energy infrastructure in Yemen."
News of the foiled plot comes after the United States, acting on intelligence information, issued a worldwide travel alert and closed a number of embassies and consulates over large areas of the Middle East and Africa this week.
Rajeh Badi, a spokesman for Yemen's prime minister, said that Yemen "ended an al Qaeda plot to attack strategic locations in Mukalla and Shabwa," referring to a Yemeni port city and a southern province.
"Large numbers of government forces are making sure the Yemeni coasts are safe from any al Qaeda attack. Al Qaeda sought to attack the oil pipelines, but failed and tried to attack through the coast of Mukalla but failed as well," he said.
However, the state news agency Saba denied there was ever an al Qaeda plot to take over Mukalla. It cited a security source it did not name.
U.S. State Department spokeswoman Jen Psaki told reporters Wednesday that the U.S. Embassy there remains closed "because we believe that a threat remains."
On Tuesday, two U.S. military transport aircraft landed in Yemen to evacuate American citizens. The UK Foreign Office has also withdrawn its embassy staff.
A senior Yemeni Interior Ministry official told CNN that "a few" al Qaeda operatives arrived in Sanaa over the past three days, which has forced government authorities to put Yemeni forces on high alert. The official could not be named, as he is not authorized to speak to the media.
"We are confident that government security forces will be able to stop any attack from taking place in Sanaa, but the militants do have a good history of operating in Sanaa," he said Tuesday.
"It's not a secret that al Qaeda also has sleeper cells in Sanaa," the source said.
Evacuation troubles Yemen ministry
Psaki said Tuesday that the United States has "a close partnership" with Yemen and that Secretary of State John Kerry had spoken with President Abdu Rabu Mansour Hadi to thank him for his efforts.
But in a sign of possible tensions with its international allies, Yemen's Ministry of Foreign Affairs said the evacuation of embassies "serves the interests of the extremists" and undermined its efforts.
"Yemen has taken all necessary precautions to ensure the safety and security of foreign missions in the capital Sanaa," a statement said Tuesday.
"While the government of Yemen appreciates foreign governments' concern for the safety of their citizens, the evacuation of embassy staff serves the interests of the extremists and undermines the exceptional cooperation between Yemen and the international alliance against terrorism."
Meanwhile, Sanaa residents told CNN of their concern about long-term security issues and fears of possible U.S. intervention in Yemen.
University student Sara al-Shibani said she felt Yemen had no option but to concede to "international powers," since the country is weak and poor. She also worries that "many Yemenis will die because of ... foreign involvement in Yemeni politics."
"The United States is making Yemenis feel that we are ... the next Afghanistan," said local banker Nasser al-Maqdashi.
Drone strikes kill 6; helicopter shot down
Six militants in separate vehicles were killed in two drone strikes in Shabwa province Wednesday morning, according to several official sources in Yemen not authorized to be named.
This was the fifth such strike in two weeks, and the second in Shabwa. A local security official, speaking on condition of anonymity, told CNN that he does not believe any of those killed were senior al-Qaeda members.
The latest strikes came a day after a pair of suspected U.S. drone strikes killed four al Qaeda militants in Yemen. Security sources told CNN about those strikes but didn't offer additional details. None of those killed Tuesday were among the 25 names on the country's most-wanted list, security officials said.