Sh1n (@hey_itsmyturn) reposted the following notice from @UK_MTO:

UKMTO WARNING 192-26

Click here to view the full warning⤵️
https://www.ukmto.org/-/media/ukmto/products/20261102-ukmto_warning-192-26.pdf?rev=c10444e50bd94bb7b822cb1220ca09c3

The source post included the hashtags #MaritimeSecurity and #MarSec.