Prosecutors are investigating the accounts of Serie A clubs AC Milan and Inter Milan as part of a probe into suspected accounting fraud in Italian soccer, sources close to the investigation said on Thursday.

The two Milan clubs were not available for comment.

In February, finance police searched the offices of all 42 soccer clubs in Italy's top two divisions, the Italian Football Federation and the body that runs the Italian league.

At the time, the clubs denied wrongdoing.

Italian soccer sides, some of which are battling record debts and heavy losses, came under increasing legal scrutiny earlier this year following allegations of widespread balance sheet malpractice and transfer irregularities.