Police and firefighters are searching the river at Haverfordwest.
According to the Mid and West Wales Fire and Rescue Service, they were called at. 9 this morning to an incident by the river.
Dyfed Powys police have issued a brief statement asking people to avoid the area.
It read: “We are currently dealing with an incident near Quay Street, Haverfordwest. Please avoid the area for the time being and find an alternative route for travel. Thank you.”
Our on-site reporter said they are blocking the area near the council offices.
There have been unconfirmed local reports that a corpse was seen in the water, but there has been no confirmation of this.
WalesOnline has contacted Dyfed Powys Police for updates but has not yet received a response.
More updates follow.