Published: Sep 21, 2013 11:48 PM EDT

WASHINGTON (AP) - U.S. officials say four American citizens have been injured in Saturday's deadly attack on a shopping mall in Kenya.
    
The officials say the wife of a foreign service national working for the U.S. Agency for International Development was killed.
    
Kenyan officials say the assault by Somali militants on Nairobi's top shopping mall killed at least 39 people and wounded more than 150 others.
    
A State Department official says consular officers have been in contact with the four injured Americans and have been providing appropriate assistance. No details about them have been released due to privacy concerns.
    
Secretary of State John Kerry called the attack "a heartbreaking reminder that there exists unspeakable evil in our world which can destroy life in a senseless instant."
    
In a statement from the White House, a spokeswoman for the National Security Council says the U.S. will help bring the perpetrators of the attack to justice.
    
NSC spokeswoman Caitlin Hayden says "We will continue to stand with the Kenyan people in their efforts to confront terrorism in all its forms, including the threat posed by al-Shabaab." She says "This cowardly act against innocent civilians will not shake our resolve."