A resident walked into her front room to find a woman in her house.
The 24-year-old, of Longwood Street, Blackburn, alerted police after the woman mumbled something in a foreign language before calmly leaving the house.
Police are appealing for help identifying the woman.
The incident happened on Wednesday, June 13, at around 6pm. She is described as Eastern European, aged 30 and around 5ft 4ins.
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