Detectives say they have had a good response from the public in their bid to catch a rapist who attacked an 11-year-old girl.
More than 40 people have called the information room following the mother's appeal for information.
The girl was attacked last Thursday in toilets at Sainsbury's supermarket in the Shire Retail Park in Leamington Spa, Warwickshire.
A reward of up to £30,000 has now been issued to find the attacker.
Sainsbury's is offering a reward of £5,000 and a newspaper, the Daily Sport, has said it will give £20,000 to help the hunt and The Sun newspaper is also giving £5,000.
Warwickshire Police have issued posters which are going up around the town and being handed out to shoppers.
Officers have said the attacker may have struck before, but they are not linking him to any previous crimes at this stage.
The girl's mother made an appeal on Monday to catch the man.
'Really serious attack'
Det Ch Insp Adrian Pearson said: "My professional judgement would be that this person hasn't acted in this way completely out of character and for the first time.
"I think he has been building up to it. He may have committed other, lesser offences in the weeks building up to this or he may have done something in his family group."
He added: "This is a really serious attack, very sustained, very determined, very cool. We really need to find this individual."
He made an appeal to teenagers in particular to come forward if they recognised the attacker.
The attacker is believed to be a teenager or a young man in his 20s, wearing a black hooded anorak-type top.
The hood was up at the time of the attack. The front of the top was red with distinctive silver vertical stripes.
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