Members of the public are being advised to avoid Marble Hall Road, and to use alternative routes where possible. Dyfed-Powys Police confirmed the road was closed at 12am today, August 5, and it is not yet known when the road will reopen. According to AA Route Planner, the road is closed in both directions from A4076 Great North Road to Cromwell Road. A spokesperson for Dyfed-Powys Police said: "Please avoid Marble Hall Road in Milford Haven due to an ongoing incident. "Please be patient and take an alternative route if possible or plan extra time into your journey.