A statement issued by Zardari's office expressed Pakistan's cooperation in a telephone conversation with Singh.

Zardari told Singh that "non-state actors wanted to force upon the governments their own agenda but they must not be allowed to succeed."

"We should not fall into the trap of the militants," he was reported to have told the Indian prime minister.

Zardari expressed sorrow over the loss of innocent life in the attacks and condemned the attacks.

Earlier, a senior government official said that Singh had requested Prime Minister Yousaf Raza Gilani to send Lt. Gen. Ahmad Shuja Pasha, head of Pakistan's Inter-Service Intelligence agency, to India for cooperation in the investigation. "The Pakistani government has decided to accept the Indian request," the official told Kyodo News. He said that the decision to send the head of its military intelligence service was taken at a meeting between Gilani and Zardari.

Singh expressed the desire to exchange information with the ISI chief when Gilani called him Friday morning to extend his government's full support to jointly combat terrorism and extremism.

Earlier, Indian Foreign Minister Pranab Mukerjee had also confirmed that India had sought cooperation from Pakistan over the Mumbai attacks.

"We are asking them to share information with us," he told reporters in New Delhi.

Mukerjee also said that a mobile telephone found at the site had received telephone calls from Karachi and evidence was leading to "neighboring countries."

Earlier media reports from India on Friday claimed that a member of the banned Pakistan-based militant organization Lashkar-e-Tayyaba has been arrested in connection with the attacks.