WASHINGTON, July 17: The US has so far not seen any evidence to suggest that Pakistan or Pakistan-based groups were involved in last week’s Mumbai blasts, a State Department official said on Monday. “The evidence to who is responsible, we have not seen yet … we will wait for the results of the investigation,” said Assistant Secretary of State Richard Boucher while briefing South and Central Asian journalists on United States policy ambitions in the two regions. Describing the blasts as a ‘horrible tragedy,’ Mr Boucher said they were executed by “somebody with evil intent, with local knowledge … lot...