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(WBIR - KNOXVILLE) At least 39 people were killed and more than 100 others injured during a Saturday afternoon shooting rampage at a shopping mall in an upscale district of Nairobi, Kenya.

USA Today reports the Islamist group Al-Shabaab has claimed responsibility for the attack. The group said it was retribution for Kenya forces' push into Somalia in 2011.

Judith Wangari is from Kenya but currently attends school at East Tennessee State University. She said her brother, Moses, works at the mall and was there when the shooting happened.

She told 10News by phone that she didn't even know anything was even going on in Kenya, until a friend at her school told her about it. Wangari then called her parents in Africa who told her that her brother was working at the time of the attack but he was now safe.

She told 10News she didn't believe he was alive until she heard his voice. She was finally able to talk with him once he left the mall.

"I wanted to hear his voice, and just know -- I knew my dad wouldn't lie and he was alive... I just wanted to hear his voice. I just remember - it was good to hear his voice, it does feel so good," Wangari said.

USA Today also reports there are Americans among the injured in the attack.

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