India keeps pressure on Pakistan over Mumbai

"Both were stressing that the original Pakistani offer, both of investigation through a joint commission and, or, a high-level visit were still very much on the table," said the diplomat.

Pakistan has detained scores of members of the LeT and an affiliated Islamic charity, the Jamaat-ud-Dawa, but India is demanding it dismantle what it calls the "infrastructure of terrorism."

Pakistan has been angered by the Indian suggestion that Pakistani state agencies were involved and what it sees as repeated Indian hints of military action.

(Additional reporting by Robert Birsel in Islamabad; Writing by Alistair Scrutton; Editing by Simon Denyer)