By KONSTANTIN TOROPIN and BRIAN WITTE

ANNAPOLIS, Md. (AP) — A post on an anonymous chat platform triggered a lockdown at the U.S. Naval Academy this week, and authorities investigating what turned out to be a false report of a gunman then shot and injured a midshipman who had mistaken them as a threat, a military official said Friday.

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The base that hosts the academy went into lockdown around 5 p.m. Thursday after it received a threat. However, the official said the threat wasn’t real — it came from a computer belonging to a former midshipman who was later confirmed to be in another part of the country. The official spoke on condition of anonymity to speak freely about an ongoing investigation.

The false report comes amid anxiety over a spate of recent violence at schoo

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