Inland Waterways Spring cleaners at Sixmilewater River in Co Antrim got the surprise of their lives last weekend when a Second World War mortar shell was discovered in the riverbed.

Volunteers for Big Spring Clean Week had already picked it up from the water, thinking it at first to be a piece of metal piping, before they realised what they really had on their hands.

The Belfast Telegraph reports that the shocking find sparked a security alert for most of the day. The nearby Dublin Road was closed while army bomb disposal experts removed the device for examination.

The bomb was described a being 20 inches long, "torpedo-shaped" and "pale green".

It joined a list of random items including a bicycle, three scooters, golf clubs and a taxi sign that were retrieved from a single 100m stretch of the river near the Antrim Forum.