A man dressed as a ninja and wielding a sword attacked a group of US soldiers training at a California airport, according to what appears to be a military incident report circulating online.
Two soldiers were left needing stitches after the assault at Inyokern Airport, an airfield about 100 miles north of Los Angeles, in the early hours of the morning on 18 September, the document says.
Records from the Ridgecrest Police Department seem to confirm details of the document, which was posted on an Instagram account on Wednesday.
The police log shows that officers were called to the airport at 1.20am where a man "with a sword" was in the parking lot, while there was at least one victim.
The log then shows an entry of a second call from the airport half an hour later, with notes saying: "Hunkered down in a hangar wondering where help is."
US Army Special Operations Aviation Command spokesman Major Jeff Slinker later confirmed the event to US media.
The document suggests the soldiers were members of the 160th Special Operations Aviation Regiment.
While the soldiers' names were redacted in the photo shared on social media, one was identified as a staff sergeant and the other as a captain.
The document describes how a staff sergeant was smoking outside the airport hangar's administration building when he was approached by "an unknown person wearing full ninja garb".
It says that the costume-clad man said to him: "Do you know who I am?" and then "Do you know where my family is?" to which the soldier said no.
The record states: "The person in ninja garb began to slash at (the soldier), striking his phone and his knee and leg."
The staff sergeant then fled across the car park where he jumped a fence and entered the administrative building.
Here, he and the captain locked doors and called 911 while the man was "kicking and punching doors and windows," it adds.
The document says the man then hurled a large block of asphalt through the window of the administration building, which then struck the captain.
The attacker fled and was arrested elsewhere, the document said.