"Nothing can be ruled out. We should allow the NIA and Anti-Terrorism Squad of Maharashtra to do their jobs. But we cannot rule out anything," said Digvijay Singh.
Digvijay also questioned the direction to which the probe was leading.
Meanwhile the BJP slammed back at Diggy and called his comments 'unwarranted'.
"Digvijay is doing politics over dead bodies of those who have been killed in Wednesday's Mumbai attacks," said Syed Shahnawaz Hussain, BJP spokesperson.
Congress which has chosen to remain mum over the issue slammed Raj Thackeray when he expressed his concern over the number of migrants in Maharashtra increasing leading to a suspicion that outsiders could be responsible for the attacks.
"Such comments were avoidable and there should not be any politics on the tragedy but some national parties and their allies or regional outfits are doing politics on terrorism, said Shakeel Ahmed, AICC spokesman.
Defending Rahul Gandhi's statement on India's success in handling 99% of terror attacks, he said, "In the same statement, Rahul added even 1% should not be allowed to happen."
The three back to back terror blasts in Mumbai left 19 dead and 131 injured.
Prime Minister Manmohan Singh after his visit to the injured vowed to get the attackers soon and expressed his sympathy with those who lost their lives in the terror strikes.