Police are searching for a 15-year-old Eastbourne boy who has not been seen since last Wednesday.
Arminas Sipavicius, who lives in Susans Road, last spoke to his mum on March 6, but she has had no contact with him since.
According to Sussex Police, it is possible the teenager is in the London area, but police are anxious to find him to establish that he is safe and well.
Arminas is described as white, 5ft 10in tall, of medium build with short light brown hair. It is not known what he was wearing when he was last seen.
A police spokesperson said: “Although Arminas is a fairly ‘street wise’ teenager, he is only 15 years of age and understandably his mother is extremely worried about him.
“If anyone knowns of Arminas’ whereabouts, or thinks they may have seen him, then we would urge them to call police immediately on 101.
“We just want to establish that he is safe.”