London’s first official Thames bathing area is closed to swimmers after authorities identify a potentially toxic bloom of blue-green algae in the water, according to reports.

The Environment Agency issues an advisory telling people to avoid entering the river at the site. The warning is based on concerns that the algae may pose a health risk, prompting officials to restrict use until conditions improve and testing indicates it is safe.

While outlets agree on the core facts—that the bathing spot is in the Thames, that a blue-green algae bloom has been detected, and that the public is being told not to swim—coverage focuses mainly on the alert itself. One report highlights the status of the area as London’s first official bathing location, framing the decision as a precautionary public-safety measure.