Mud is not a reasonable footing.
The entire area that received water causing flooding has been disturbed and is no longer reliable to past experience with that land or river.
There is no degree of safety in that flood plain. Those searching must stop until it is clear to look again. There is no degree of luck that matters. Anymore rain increases the danger. Any search and rescue dogs cannot work in dangerous conditions.
Everyone move to safe elevation.
Those missing and alive can be located with infrared technology.
Where are the ministers?