U.S. officials have told their Indian counterparts they want a speedy result and more accountability after their investigation into Indian involvement in a foiled murder plot against a Sikh activist in the United States, according to a U.S. official.

An Indian Enquiry Committee visited Washington last week to discuss India's own investigations after the Justice Department alleged an Indian intelligence official had directed plans to assassinate dual U.S.-Canada citizen Gurpatwant Singh Pannun, a Sikh separatist, last year.

"We've communicated really clearly that the U.S. government isn't going to feel fully satisfied until we see that meaningful accountability takes place," said a U.S. official who declined to be named. "We have been emphasizing that we hope that India will move as quickly as possible through their investigative process."