The RUC are investigating two incidents that occurred last night in Belfast.
Shortly after 1.30am this morning a small pipe bomb was thrown through the letterbox of a house on Snugville Street.
The man and woman, who were in the house at the time, were not harmed in the attack.
Meanwhile, shots were fired through the window of a separate house in the city just before midnight.
There were no injuries in the attack and no motives for the incident have been established.