Gardaí investigating a grenade attack on a house in Drimnagh have sealed off a second scene following the discovery of a burnt-out car.

The scene is being forensically examined to see if it was used in the latest in a string of violent attacks in the south-city area.

This morning's attack is the latest in a series of incidents this week linked to rising tensions in an ongoing murderous criminal feud.

At around 2.20am a rock was used to first smash the window on the front door a house on Knocknarea Avenue in Drimnagh, then a grenade was lobbed in to the hall.

It exploded causing major damage to the house but detectives say it was extremely fortunate that the four adults and to children asleep inside were not seriously injured or killed.

A red Fiat Punto was later found burned out on nearby Sperrin Road and both scenes have now been sealed off for forensic examination.

Gardaí believe the attack is linked to the two shootings during the week where a grandmother in her 50s was shot in the shoulder, and the home of one organised crime leader's grandparents was fired on.

This morning's attack was another on innocent relatives - parents of people believed to be connected to the feud – but the intended target was not in the house at the time.