No-one has claimed responsibility for Wednesday's attack and the initial police investigation has failed to unearth any clear leads on the blasts.

"Counter-terrorism has always been part of our strategic dialogue," an Indian foreign ministry official told AFP ahead of the Clinton talks on condition of anonymity. "The July 13 attacks will be part of the exchange."

Clinton said last week that it was "more important than ever that we stand with India" and she reaffirmed her "commitment to the shared struggle against terrorism."

Clinton, who was in Athens on Sunday to offer support for the Greek government as it tries to tackle its perilous and worsening debt crisis, is scheduled to take in China, Hong Kong and Indonesia on her travels.

Copyright AFP (Agence France-Presse), 2011