Must win war on terror: Manmohan

“I am confident that this is a war we will and we must win,” said Manmohan Singh on the massive bombing that left 11 people dead and 76 injured.

In an appeal to political parties, he said: “Instead of wasting time in mutual recrimination, all political parties must pool their wisdom” on the issue.

Speaking to reporters while returning from Dhaka on board his special aircraft, the prime minister said he couldn't say with certainty who was behind the Delhi blast and that he has spoken to Home Minister P. Chidambaram about it.

He acknowledged that there were "weaknesses" in the security system that needed to be plugged. He said: "Several mechanisms were put in place after the Mumbai blasts... there are weaknesses in our system, we must work hard to plug the weaknesses."

On the Teesta issue, which was one of the main accords expected to be signed during his visit but could not with West Bengal Chief Minister Mamata Banerjee staying away from accompanying him on the trip, the prime minister said that "provincial sentiments cannot be wished away" and his government would continue to work with her.

"We are a country of great diversity" and these problems can arise, the prime minister said.

"I was in touch with Mamata for quite some time," on the Teesta issue. He said that the officials concerned had to been told to brief Mamata Banerjee and to seek her guidance on the Teesta water sharing issue.

"I was told that it sorted out," he said and added that Railways Minister Dinesh Trivedi, who is part of Banerjee's Trinamool Congress, had raised objections to it.

National Security Adviser Shivshankar Menon was working on getting the agreement done.

"One learns from ones mistake...We will continue to work with Mamata Banerjee," he said.

On the Dhaka visit, Manmohan Singh said that India has achieved a "broad umbrella agreement" with Bangladesh that would serve as the pathway for the future. He hoped that with the demarcation of the India-Bangladesh boundary, "the unfortunate incidents like illegal movement will be things of the past".