The director of the US Federal Bureau of Investigation (FBI) arrived in Pakistan on Wednesday to help investigate last year's Mumbai attacks, officials said.
New Delhi blamed the attacks, which killed 165 people last November, on the Pakistan-based militant group Lashkar-e-Taiba (LeT) and the siege soured a five-year peace process between nuclear-armed India and Pakistan.
FBI director Robert Mueller will hold talks with Pakistan interior ministry chief Rehman Malik on Wednesday, a ministry official told AFP.
Mueller is heading a team which has just held meetings in India and would assist Pakistani investigators by providing further intelligence information, he added.
US embassy spokesman Jeremiah Knight also confirmed Mueller's arrival in Islamabad, but declined to give details about his meetings.
Mueller's visit comes a day after unknown gunmen attacked Sri Lankan cricketers in the Pakistani city of Lahore which left six policemen and two civilians dead.
Indian police have charged the man accused of being the lone surviving gunman in the Mumbai attacks with murder and "waging war against India".
The suspect, Pakistan's Mohammed Ajmal Amir Iman -- also known as Kasab -- was the only alleged member of the 10-man Islamist commando-style unit captured alive during the November 26-29 siege.
Both LeT and Pakistan have denied any involvement in the attacks but the government in Islamabad admitted last month for the first time that the strikes were partly planned on its soil.
Islamabad said it had filed a case against eight people suspected of a role in the attacks, and that six of them were in custody.