The attacker ran off, leaving the woman needing 50 stitches. The youth was described as aged 16, about 5ft 2in, with brown curly hair. He was wearing a black baseball cap and a black hooded zip-up top. Det Sgt Wayne Seymour, of Dorset Police, said: "After attacking this woman, the man responsible ran off along East Howe Lane towards Brook Road. "I'm releasing an e-fit... in the hope that someone will recognise him. "I'm also keen to hear from anyone who saw the attack or saw a man matching this description fleeing the area." A 58-year-old man from Bournemouth has been arrested and released on bail while inquiries continue.