Foreign Secretary Shiv Shankar Menon said the country would hand over evidence gathered by police showing the Inter-Services Intelligence (ISI) agency and Pakistan-backed Lashkar-e-Taiba helped plant the bombs that killed 186 people.

Menon, who most recently served as ambassador to Pakistan, said that Islamabad's repeated denial of any involvement in the blasts would have to be reassessed after it reviewed the evidence and that India would "judge it by its actions."

Last month, India and Pakistan agreed to share intelligence on terrorist activities in the region when Indian Prime Minister Manmohan Singh and Pakistan President Pervez Musharraf met on the sidelines of a summit in Cuba.

India's decision to hand over evidence gathered by police would be the first test of the agreement which came after New Delhi delayed high-level peace talks in response to the July 11 bombings.

On Saturday, Indian police in Mumbai said that interrogations of suspects arrested in the case revealed "a professional, precise and well-planned operation" with links to Pakistan's intelligence agency and the outlawed Lashkar-e-Taiba (LeT).

Islamabad Saturday immediately rejected claims of ISI involvement as "totally baseless".

"This is a totally baseless and fabricated allegation and we reject it," Interior Minister Aftab Sherpao told AFP.

Militant Kashmiri and Islamist group LeT, blamed for previous attacks in India, has also denied involvement in the July bombings.

The new allegations come after Musharraf last week visited Washington where US President George W. Bush praised the military's leader's efforts in fighting terrorism.

Altogether, police have arrested 15 people in connection with the blasts, although three of them may be released. "The role of 12 people has been directly established," Mumbai police commissioner AN Roy said.