ARLINGTON (CBSDFW.COM) – An Arlington ISD educator is in jail after police say he engaged in sexual activity with a student on a school bus.

Arlington Police arrested Chima Lemael Kalu Nsi and charged him with having an improper relationship with a student.

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Chima Lemael Kalu Nsi (photo credit: Arlington Police Dept.)

The alleged offense happened last month on an AISD school bus while Nsi and the victim were the only ones on the bus, said Arlington police.

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It was corroborated by the video surveillance system.

The alleged offense happened September 27 and was reported Oct. 1, according to police.

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Nsi’s bond is $15,000