Blast investigations gather momentum but no major breakthrough has been reported in Tuesday's attacks on commuter trains in Mumbai.
Separately, Maharashtra Chief Minister Vilasrao Deshmukh said investigators would be able to zero in on suspects in a week’s time.
There is no clear word on the type of explosives used but a forensic lab ruled out RDX. The National Security Guard's Bomb Data Centre will be asked to help.
Three men were arrested in Beed district in connection with the blasts.
In Mumbai, 25 commuters came forward with information about suspicious looking men.
But conflicting descriptions made it difficult to draft final sketches. The police are questioning large numbers of those with criminal records.
The West Bengal Government has stepped up security throughout the state and its border with Bangladesh as police continue to crackdown on suspected offices of the banned Students Islamic Movement of India (SIMI).
The Tripura police have arrested 11 suspects trying to cross over to Bangladesh. They will be brought to Mumbai.
An aid counter has opened at Churchgate station where victims or their families received government compensation on producing death certificates or hospital records.
The government announced Rs five lakh if the victim had died and Rs 10,000 for those who suffered simple wounds in the attacks.
The aid is distributed between 9 am to 7 pm.
Secretary level talks scheduled between India and Pakistan have been cancelled after New Delhi said it was convinced of Pakistan's involvement in the Mumbai blasts.
Pakistan has denied involvement in the attacks.
Prime Minister Manmohan Singh made a direct reference to the Pakistani connection in the blasts during his Mumbai visit.
"We have been trying to normalise relations with Pakistan but we have explained to the government of Pakistan at the highest level that unless Pakistan curbs terrorist activities, no government can continue with a peace process.
"Pakistan had assured us in 2004 that it would not aid and abet terrorism on its soil it has to fulfill that obligation," said Singh.
The talks were to be held on July 21, during which the two sides were to review the third round of their composite dialogue.
There has been another fallout of the serial blasts in Mumbai.
Two MPs Sandeep Diskhit and Brinda Karat, who were to travel to Pakistan on Sunday, to take part in the Commonwealth parliamentarians' conference in Islamabad have cancelled their visit.
The Commonwealth conference is being held to discuss gender issue.
President APJ Abdul Kalam has announced that he will be visiting Mumbai blast victims on July 17. [Source NDTV Website]
