London, May 23 (PTI): Pakistan interior minister Rehman Malik believes US had a mole right inside Osama bin Laden's Abbottabad hideout and this was how the al-Qaida chief was tracked down, a media report said on Sunday.

Top US officials said after the raid that they were only partially certain of Osama's presence inside the $1 million mansion, but Malik says only definitive information could have led them right to the room where bin Laden was killed, according to a report in The Sunday Times. The report also says that bin Laden's Saudi wives believe it was his younger Yemeni wife Amal who betrayed him.

"In my experience of years as an intelligence officer, I think someone from inside may have given information," said Malik. "If the Americans didn't have definitive information, they couldn't have gone straight to the room where bin Laden was," he was quoted as saying by the paper.

A pocket guide carried by the US Navy Seals who killed Osama, suggests "bin Laden had fathered twins in captivity" referring to the unidentified children born this year to his youngest wife Amal, 28.

The document, left behind in the compound, lists the names and ages of those who were present, including bin Laden's wives, children and grandchildren. It also details where they lived in the compound and when they arrived.

According to the report, after the mission Obama said he had been "only 45% to 55% sure that bin Laden was even in the compound". The document, which is believed to have been carried by all the Seals on the mission, however, indicates that US intelligence was certain of his presence.

Some Pakistani officials, including Malik, believe the briefing points to the presence of a mole in the compound. The two elder Saudi wives of bin Laden have accused Amal of betraying bin Laden, either by supplying information or by allowing herself to be tracked to the compound.

There have been reports of visits to the compound by donors and a Taliban commander. The other possibility is that US drone technology is far more sophisticated.

Documents also reveal for the first time that the two courier brothers moved to Abbottabad in 2006 from Mardan where Abu Faraj al-Libbi, the al-Qaida No 3, was captured in May 2005. According to Guantanamo detainee assessment published by WikiLeaks, he was caught while waiting for a courier. He had earlier been living in Abbottabad.

According to the report, an employee at Abbottabad Post Office was tracked after he received suspiciously large cash transfers and he led investigators to Umar Patek, one of the Bali bombers, arrested in Abbottabad in January. All these arrests in the same area seem more than coincidence, it said.