An explosion has damaged a number of houses in the Brandywell area of Derry, police have confirmed.
The blast occurred at around 11pm on Thursday.
It is understood masked gunmen forced their way into the Lecky Road house and threw the bomb.
Nobody was injured in the incident, however, a young child was believed to be asleep close to where the explosion happened, causing shrapnel to go through the window of a bedroom.
Foyle MLA Martina Anderson said she was amazed nobody was hurt in the attack and added it was unclear who or what was the target.
Ms Anderson said: “In that bedroom, thankfully, there was no-one asleep at the time.”
She said in the next room there was a two-year-old baby in a cot and the family was devastated thinking about what could have happened if the shrapnel had gone through the window.
Derry’s MP Mark Durkan says the bomb has left people “ shocked and disgusted.”
“People are outraged that this device has exploded in a closely built-up area and closely knit community.
“It is no thanks to those who planted this device that we are not talking about the serious injury of infants or worse.
“This was an attempt to show bravado and a way of community control but what we are seeing now is community contempt.
“Those responsible for this attack have no regard for anyone except their own warped and violent egos.”