The PSNI is treating two separate pipe bomb attacks in Derry early today as hate crimes.
Police believe a pipe bomb exploded outside a house at Lapwing Way in the predominantly loyalist Waterside area at around 1.30am.
No damage was caused and the four adults and child who were in the house at the time were not injured.
At around the same time another pipe bomb exploded outside a house in Lincoln Court nearby, damaging the front door.
Four adults who were in the house were not injured.
Police believe the two attacks were linked and are treating them as hate crimes.
The remains of the two devices were taken away for forensic examination.