"It does surprise me. I don't know the details," Musharraf told CNN-IBN, after US President Barack Obama announced in Washington that the world's most wanted terrorist had been killed in a US-led operation.
Musharraf, who was the Pakistan president during the 9/11 strike, said the operation by US forces was a "violation of our sovereignty".
Responding to a query, Musharraf said: "If there is lack of trust, it is very bad. We are fighting the same enemy."
He said the operation was a failure of intelligence, "a failure of both Pakistani and US intelligence".
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