Advani, who arrived here to visit the blast sites and the hospitals where the injured were being treated, told reporters at the airport "it is good that Pakistan has condemned the incident.

"But the people of Mumbai remember that those who perpetrated a bigger tragedy a decade back claiming over 250 lives here and were wanted by the Interpol and the courts, besides being declared as absconders, were enjoying the patronage of Pakistan. They must be handed over to India," he said.

Advani said: "This raises doubts about the credibility of Islamabad's condemnation of yesterday's incidents".

Meanwhile, surveillance all over the metropolis and the state has been stepped up following the twin blasts in Mumbai and in view of the ongoing Kumbh Mela in Nashik, according to Director General of Police OP Bali.

"Surveillance from air and at ground level would be intensified at Nashik in view of the ongoing Kumbh Mela," Bali told reporters after the high-level meeting at Mantralaya here on Tuesday.

The Deputy Prime Minister, who held talks with Maharashtra Chief Minister Sushilkumar Shinde, Deputy Chief Minister Chaggan Bhujbal and senior police officials at the airport, said he hoped the state government would be able to arrest the culprits and make suitable arrangements for the future.