Police sources today said so far concrete evidence has emerged only in three matches on May five, nine and 15 and three players --Sreeshant, Ajit Chandela and Ankit Chavan -- were arrested, besides 11 bookies.
It has also come to light that Amit Singh, one of the bookies arrested, had played for Rajasthan Royals in the previous IPL season.
A senior police official said telephone conversations have indications about spot-fixing in other matches but the investigators have not been able to concretely prove that as of now.
The sources said the players were embarrassed and were not opening up initially while bookies were talking.
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Sreesanth and two other bowlers were arrested in a post-midnight operation in Mumbai yesterday by the Delhi Police for spot-fixing IPL matches for payments of upto Rs 60 lakhs just for giving away pre-determined number of runs in an over.
The arrested cricketers and the bookies were remanded in police custody for five days by a Delhi court yesterday for questioning in connection with the case.