People have been warned to be vigilant after a toxic plant that can cause burns was spotted along a river bank.

The Broads Authority said to watch out for the invasive giant hogweed, which was seen on the banks of the River Wensum in Norwich earlier this month.

The organisation urged people to report any sightings of the plant, saying "please be on the lookout" in a post on Facebook.

Eastern Daily Press: The giant hogweed plant was spotted earlier this month The giant hogweed plant was spotted earlier this month (Image: Broads Authority)

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Giant hogweed produces a phototoxic sap that can cause severe burns and blistering when it comes in contact with skin and is exposed to sunlight.

The plant negatively impacts biodiversity by forming dense canopies which can shade out native vegetation and can burn pets such as cats and dogs as well.

READ MORE: Invasive plant species in Norfolk you should watch out for

Before it erupts with its tall, cow parsley-like flower spike, it can be identified by its large rhubarb-like leaves.

Sightings can be reported to the Norfolk Non-Native Species Initiative, an organisation that monitors the impact of invasive species in the county.

Sightings can be reported by taking a photo and sending a 'what3words' location to NNNSI@norfolk.gov.uk.