A 14-year-old boy is missing from home in Withnell, near Chorley.
Jamie Norman was last seen at Blackburn Youth Zone on Jubilee Street at around 5.45pm on Thursday.
He is white, 5ft 1in tall, slim with short mousey hair.
He was last seen wearing Adidas tracksuit bottoms, a black baseball cap and black trainers.
Officers believe he could be in the Blackburn area.
PC Ted Ross of Blackburn Police said: “Jamie has been missing for nearly a week now and we are becoming increasingly concerned about him.
“If anyone has seen Jamie or knows of his whereabouts, I would urge them to contact us. Similarly, I would urge Jamie, if he sees this appeal, to get in touch with us to let us know he is safe.”
Anyone with information should contact police on 101 quoting log reference LC-20150312-1486.