Posters appealing for information to trace a 14-year-old girl were put up as Sussex Police renewed calls for help from the public.
Alex Heamen, who left her home in Abergavenny Road, Lewes, to meet friends in Brighton for the weekend on September 1 has not been seen for 11 days.
A friend last saw her walking with two men along Palace Pier on September 4.
Officers spent yesterday carrying out house-to-house inquiries in Lewes and questioning people along the Brighton seafront as fears for the teenager's safety grew.
Posters appealing for information were put up in Brighton and Lewes in the hope people might recognise her.
Police reiterated that neither Alex nor her friends were in trouble and urged anyone who knew where she might be to contact her family or the police.
The popular Lewes Priory School pupil is described as about 5ft 6ins with dyed medium brown hair.
She was wearing a white jacket and light blue jeans tucked into black boots.
Anyone with information should call 0845 607099, quoting Operation Warren.
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