A woman was tied up in her Lancashire home by two armed burglars - one of whom is thought to be 14 years old.
The pair forced their way in to a house in Shearwater Drive, Blackburn, at about 2045 GMT on Friday. One was carrying a knife.
They tied the 36-year-old woman's hands before fleeing with jewellery and cash.
The pair are both described as Asian. One was aged 14 to 15, and 5ft 3in (1.6m) tall. The other was aged about 25 and 5ft 10in (1.8m).
The teenager was wearing a hooded jacket with the hood up and the man had dark tracksuit trousers and a black hooded jacket, also with the hood up, police said.
Det Sgt Tim Brown, of Lancashire Police, said: "This is a very serious offence and must have been particularly upsetting for the lady involved.
"We know the two men left the house via the back yard or garden on to Shearwater Drive and, even though it was dark, I'm sure there were lots of people about at the time that may have seen something important."
He urged anyone with information to contact police.