Samajwadi Party leader Amar Singh on Wednesday accused the Congress of using the Central Bureau of Investigation (CBI) against his party chief Mulayam Singh Yadav.

"CBI has become Congress Bureau of Investigation," Singh alleged, reacting to the reports that the premier had gone by the allegations made in a PIL against Yadav even without verifying them from his family members.

"Congress is not giving regional parties their due, which is a matter of concern," the SP leader told reporters at the party office here.

Singh alleged that the CBI had registered a disproportionate assets case against Yadav on the basis of the PIL without verification.

"It should be proved that the alleged assets, including a cinema hall and a hotel, belong to Mulayam Singh," he demanded.

Samajwadi Party today stepped up its attack on the Congress accusing it of virtually adopting a 'use and throw' policy towards allies ranging from Left parties to NCP, RJD and SP.

"When the utility is over.. they (Congress) even do not recognize. That is clearly visible," SP general secretary Amar Singh told reporters here as the criticism of the Congress remained unabated in the wake of fresh developments in the Supreme Court on the disproportionate asset case against Mulayam Singh Yadav.

Singh recalled that the cases against BSP supreme Mayawati vanish when her party supports the Congress in Presidential election.

"Once elections are over, they resurface," he said adding that he was no friend of Mayawati.

Citing some other instances, he said cases are slapped depending on relationship.

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