Gardaí investigating the murder of Dean Johnson in Dublin a year and a half ago have arrested three men in connection with the investigation.

The 21 year old was fatally shot at Harelawn Green in Clondalkin on August 24th 2013.

Three men; two in in their 20s and one in his 30s were arrested in Dublin today in connection with the incident.

Two are being questioned at Lucan Garda Station and one at Ronanstown Garda Station.

It brings to 13 the number of people arrested in connection with the investigation.