A north Belfast man whose house was targeted said it was the latest in a long line of attacks by republicans.
The man was at home with his wife and pregnant daughter in Alliance Close when a device smashed through the roof into the attic.
It happened at about 2330 BST. The man, who did not want to be identified, said he is considering moving out.
"It terrified me and my young daughter was very terrified," the man said.
"She's six months pregnant, she was in hysterics when it happened."
The man said the family were attacked because they are Protestants.
"This happend on a regular basis and but for the grace of God no-one was hurt."
He said the windows of his house had been broken with golf balls and other missiles in the past.
Remains of the device have been taken away for scientific examination, and police have appealed for anyone with any information to contact them.