Gardaí make fourth arrest in Alan Ryan murder probe

Gardaí investigating the murder of leading republican dissident Alan Ryan have arrested a man in his 20's.

He was arrested in Artane area of Dublin this afternoon and is being held at Coolock Garda Station.

32-year-old Alan Ryan was shot dead in Clongriffin in North Dublin last September.

It is the fourth arrest as part of the investigation.