According to media reports, the Maharashtra ATS is in touch with the Kolkata STF.
Meanwhile, sources said that the NIA visited Ahmadabad to question IM suspect Danish Riyaz.
Danish was arrested in connection with the Ahmadabad blast in 2008.
The Mumbai ATS is on a lookout for Abdul Nata an IM terrorist. The Mumbai ATS has also sought details of passengers who were travelling from Kolkata to Mumbai and Kolkata to Kanpur from the Kolkata STF.
Meanwhile, an IB report revealed that terrorists are planning to strike Bhakra Nangal Dam situated in Himachal Pradesh.
The three back-to-back terror bomb blasts left atleast 18 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.