Bathers are being urged to avoid Tigne's pet-friendly beach because of the "presence of white material".

The Environmental Health Directorate said in a statement it was looking into determining the source of contamination.

The directorate does not yet know when the site will be safe for swimming again.

Signs alerting swimmers about the health risk have been installed on site. When the quality is restored, the signs will be removed.

More information on 2133 7333 or wrau.ehd@gov.mt