Pakistan has rejected allegations by India's prime minister that the bombers responsible for the deadly train blasts in Mumbai were "supported by elements across the border."
Mumbai is the Indian city formerly known as Bombay.
A spokeswoman for Pakistan's Foreign Ministry Tasnim Aslam called the allegations unsubstantiated, but she also said the peace process must continue.
She said the peace process is a separate matter and it is in the interest of both Pakistan and India and the whole region for it to go forward.
Manmohan Singh made the accusation on Friday during a visit to Mumbai, where he met with survivors undergoing treatment in local hospitals. He also was expected to meet with officials investigating Tuesday's bombings, which killed about 200 people and wounded 700 others.
Mr. Singh said Pakistan must rein in terrorists on its soil before the peace process can continue.
Indian authorities are searching for three suspects in the coordinated bombings, including a terrorist mastermind named Rahil. The other two suspects were named as Sayyad Zabiuddin and Zulfeqar Fayyaz.
Indian officials said Thursday the prime suspect in the bombings is Lashkar-e-Toiba, an outlawed Pakistan-based Islamic militant group that operates in Indian Kashmir. Lashkar denies any involvement.
In another development, officials in Nepal say they are investigating two Pakistanis for possible links to the railway bombings. They say the two were detained in connection with the discovery of powerful explosives in Kathmandu in 2001.
New Delhi television has reported that police are investigating phone calls made to Dubai and the Pakistani city of Karachi minutes before and after the blasts.