Two houses were burgled in the Woodbrook area of Derry in the early hours on Monday.
An attempt was made to enter a third property.
Detectives in Derry have launched an investigation into the burglaries.
Police believe that the incidents happened sometime between the hours of 1.45a.m. and 7a.m. Computer equipment was reported stolen from two of the properties involved.
A male wearing dark clothing and a hat was seen in the area at the time of the incidents and police would be keen to speak with this man.
Police would also appeal to anyone who observed any suspicious activity in the area to contact detectives at Strand Road on 101 or Crimestoppers anonymously on 0800 555 111.