Three people were being held last night by gardai investigating a fatal shooting at a halting site in Mulhuddart on Wednesday. A man and a woman were arrested by gardai early yesterday in connection with the shooting of Mr Matt Hand, a married man in his 30s, at a halting site in Ballycoolin Road. The pair are being held at Blanchardstown Station along with another man who was arrested on Wednesday. Gardai are seeking another man thought to have been injured in the incident.