Washington: The United States has asked Pakistan to answer to its questions with regard to the 26/11 Mumbai terror attack, a State Department official said.

"We have asked the Pakistani Government to address those allegations in the past," State Department spokesman Mark Toner said when asked about the alleged involvement of Pakistan's Inter Services Intelligence (ISI) in the Mumbai terrorist attacks.

Toner, however, refrained from giving any further details citing it as a legal matter as trial of Pakistani-Canadian Tahawwur Hussain Rana were on.

"There's a legal process underway, and anything I say from here can obviously... I think we have been clear, again, that this is an ongoing legal process, trial, and so I can't say a lot about it," he said.

"But speaking globally about the Mumbai attacks, we have asked that all parties answer questions that have been raised by the Mumbai attacks," Toner said.