A middle-aged man suffered severe burns and three houses were extensively damaged in a suspected gas explosion.
The top half of one of the terraced homes on Sullivan Street near Infirmary Road in north inner city Dublin was completely destroyed in the incident with the roof blown off.
It was the middle of the three homes worst affected in the explosion and it is believed to have been the source of the suspected gas leak.
A window frame from the property was also blown into the air with the force carrying it two streets away to the edge of a children's playground just inside the Phoenix Park.
Dublin Fire Brigade said a 58-year-old man was taken to the Mater Hospital for treatment to extensive burns and other injuries.
A number of houses opposite the worst affected home were also damaged, with the front windows of one blown in.
Gardai said the alarm was raised at about 6.20pm and the sound of the explosion could be heard in the force's nearby headquarters and further across the north inner city.
It is believed to have occurred in the attic or upper floor of the worst affected property.
Dublin Fire Brigade crews were tasked to the scene along with local gardai and gas specialists.
Infirmary Road was closed to traffic following the incident.