Prime Minister Manmohan Singh today demanded a thorough investigation into the presence of Osama

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bin Laden in Pakistan for several years, but ruled out a US-type operation by India to eliminate Pak-based terrorists wanted by it.

"One needs to go for a thorough investigation into the presence of Osama bin Laden for such a long time on the soil of Abbottabad," he said at a joint press conference here with Afghan President Hamid Karzai after their talks.

The killing of bin Laden was a "unique moment" in the history of the region, said the Prime Minister, who arrived here earlier on a two-day visit amidst highest levels of security.