Authorities in Yemen have arrested at least 25 people with suspected links to al-Qaida in connection with Wednesday's attack on the U.S. embassy in the Yemeni capital, Sanaa.
The assault killed six Yemeni security personnel and four bystanders, including an 18-year-old American woman and the Yemeni man she recently married. Six attackers also were killed.
Officials say the militants used car bombs, grenades and automatic weapons in the attack. Yemeni guards and police fired back, preventing the attackers from breaching the embassy's security walls.
The Yemeni government has vowed to find anyone else involved in the plot and bring them to justice.
The U.S. government is recommending that Americans put off non-essential travel to Yemen, and warns those already in the country should make contingency plans.
U.S. President George Bush said the attack is a reminder that the United States is at war with ideological extremists.
The United Nations Security Council and U.N. Secretary-General Ban Ki-moon also condemned the embassy assault and called for the perpetrators to be brought to justice.
U.S. State Department spokesman Sean McCormack said the assault bears the hallmarks of al-Qaida, but the U.S. has not concluded who is to blame. A group calling itself Islamic Jihad in Yemen claimed responsibility and threatened further strikes.
Islamist militants have attacked the U.S. embassy in Sanaa several times since 2003. The most recent was in March, when mortars targeting the compound landed on a nearby girls' school, killing a Yemeni guard and wounding dozens of students.
The U.S. State Department authorized non-essential staff to leave Yemen in April. It repeated that authorization today.