http://www.irishtimes.com/newspaper/breaking/images/2010/0714/257541_1.jpg?ts=1279151729GardaĆ­ investigating the murder of Stephen Byrne in Dublin yesterday evening say his killer arrived and left the scene on a bicycle.

The 32-year-old was shot a number of times in the head and body near his home in Sheriff Street at around 4.45pm.

A man in his late 20s and a 15-year-old boy have been arrested and are being questioned in connection with the murder.