NEW DELHI: Police probing India's biggest corporate scandal said Thursday the fraud involving outsourcing company Satyam totalled over three billion dollars, double the amount originally suspected.

The Central Bureau of Investigation (CBI) which filed new charges on Tuesday against 10 suspects, including company founder and chairman B. Ramalinga Raju, warned the scandal could grow further.

"The supplementary chargesheet we filed this week takes to 140 billion rupees (3.01 billion dollars) the total amount we believe is involved in the scandal," CBI's deputy inspector general V.V. Laxmi Narayana told AFP.

"In a couple of days we will file another chargesheet in the case" which could increase the amount police suspect was swindled, said Narayana, head of the probe.

The earlier estimate of the fraud was 71.36 billion rupees.

Narayana said the latest figure was based on "disclosures" allegedly given to investigators by Raju and the nine other suspects in the case during questioning.

Raju stunned India's financial world in January when he declared he had overstated profits for years and inflated the company's balance sheet by more than one billion dollars.

Raju, his brother and eight other people were placed in custody on charges of conspiracy, cheating, forgery and falsification of accounts. The Satyam founder is in hospital being treated for cardiac problems and hepatitis, while the rest are in jail.

In April, mid-sized Indian computer outsourcer Tech Mahindra, part of leading Indian vehicle maker Mahindra and Mahindra, paid nearly 600 million dollars for a majority share in Satyam, rescuing it from imminent collapse.

However, Vineet Nayar, a senior Satyam executive, told Dow Jones Newswires that he doesn't expect any additional liability from the new fraud allegations.

"The CBI is talking about fraud by some individuals," he said. "It has nothing to do with the company as such."

Satyam, based in the southern Indian city of Hyderabad, re-branded itself as Mahindra Satyam as part of an attempt to recover from the scandal.

Shares in the company closed up 2.43 percent or 2.2 rupees at 92.75 rupees following the company's assurances after sliding nearly 11 percent the previous day.

The suspects had allegedly used various methods to swindle money including forging board resolutions to illegally obtain loans, used fake invoices to get money and falsified other accounts, CBI officer Narayana said.

Corporate Affairs Minister Salman Kurhseed, meanwhile, praised Tech Mahindra for its work in rescuing the struggling company.

"Let us trust the good work that they are doing," the minister said in New Delhi.

Satyam was ranked as India's fourth-largest information technology services group by revenues when the scandal broke. Its clients included some of the world's biggest companies such as Nestle, General Electric and General Motors.