Only non-life threatening injuries so far thank goodness.
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From what I see from latest info, the ship was undergoing a pierside availability maintenance / modernization period, typically referred to as an "SRA" or Ship Restricted Availability", i.e., the ship is officially not able to rapidly deploy and is sort of an accounting system DoD uses to keep track of what assets are readily available at any time. Any aircraft or ordnance is off-loaded before the start of work.
My fellow squid and Marine bubbas here are likely familiar with this process. Unlike going into a shipyard and or dry dock for an extensive upkeep period, these pierside events are usually about three months, and a lot of the crew is often moved off to make room for all the "sand crab" heavy contract work is done by specialized groups of civil service and contracted workers. A liberal leave posture is also in place because manning levels for an operational sortie are not required.
During a normal week, most of the ship's crew may be back on board for a normal workday and doing some of their own upkeep work they are capable of doing - some painting, low level maintenance etc. Others may be off for training and other events.
In summary, there is an old saying that applies here: " -- the only thing to look forward to in a shipyard is fires and flooding--"
On a Sunday, likely the only Navy personnel on the ship were some minor security and fire watches. A lot of the responsibility for the condition of the ship has been shifted to the Navy Supervisor of Shipbuilding in that local area, who manages the SRA process.
I can only speculate, but careless temporary storage of materials / equipment in the well deck area ,or even sabotage, are possibilities. Remember the nuke sub at Portsmouth that was torched by a yard bird so he could get off early on a Friday?
This is going to be a big operational and financial blow to the Navy/Marine Corps team amphibious readiness posture. Think of this - you can scrape and repaint metal that has been in a fire area, but the unbelievably extensive electrical cable runs in any warship can get burned through, and they are very difficult and expensive to fix. Anyone who has walked through the passageways of a warship, even a visitor, has probably noticed these extensive "bundles" running along the overhead to various parts of the ship.