(CNN) -- A Florida resident and cousin of a Palestinian teenager killed in Jerusalem this week is the young man seen in separate videos being held down and pummeled by men in the uniform of Israeli security forces, relatives said. Tariq Khdeir, 15, a high school sophomore in Tampa, was visiting his Palestinian relatives in Jerusalem for the first time in over a decade when he was attacked and detained, family members told CNN. Tariq, born in Baltimore, was outside the home of his cousin, who was kidnapped and killed on Wednesday in an incident that has further stoked tensions between Palestinians and Israelis. The tensions already had risen sharply after three Israeli teens were found dead in the West Bank.
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NEW: A note from the detained boy tells his parents he is OK and not to worry, an uncle says
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Tariq Khdeir, 15, was born in the U.S. and is a high school sophomore in Tampa, Florida
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He was visiting his Palestinian relatives for the first time in over a decade
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Israel's Justice Ministry says it will investigate the beating
Khdeir's father told CNN that a U.S. consular officer visited the teen in a @placeholder detention center in Jerusalem.