30-year-old man stabbed in unprovoked attack in Cobh, Cork harbor; man in his 50s arrested.

30-year-old man stabbed in unprovoked attack in Cobh, Cork harbor; man in his 50s arrested and detained at a Garda station in Co Cork; stabbing victim in stable condition at Cork University Hospital; Gardaí investigating the incident and reviewing CCTV footage from the scene.