Police arrested a Maryland man Monday for allegedly knowingly transferring HIV to women he met on dating apps, a report said.

Rudolph Smith, 34, of Frederick, Md., was indicted on four counts of first-degree assault, reckless endangerment and other charges, Fox 5 in Washington, D.C. reported.

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His arrest came after a 21-month long investigation that began after a tip.

Several women have been identified and contacted, but it is unclear how many alleged victims there are.

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Police contacted several victims before bringing the case to a grand jury, WJZ in Baltimore reported.