The US on Tuesday said bringing to justice the perpetrators of 26/11 was still an "unfinished business" which was high on its priority, days after Pakistani American LeT terrorist David Headley was sentenced to 35 years in jail by a Chicago court.

"We are not walking away. This is one of our very high priorities," US Secretary of State Hillary Clinton told an Indian journalist while responding to a question related to the Mumbai terror attack and Headley's sentencing.