India ? India suspects that two senior leaders of a banned Pakistani militant group masterminded last week’s three-day terrorist attacks that killed 171 people in Mumbai, an Indian intelligence official said today.

Evidence collected in the investigation of the deadly siege points to Zaki-ur-Rehman Lakhvi and Yusuf Muzammil, the official said, speaking on condition of anonymity because he wasn’t authorized to speak publicly about the details.

Lakhvi and Muzammil are believed to be top members of the outlawed Pakistani group Lashkar-e-Taiba, which India blames in the attacks. Muzammil is the group’s chief of operations in Kashmir and other parts of India and Lakhvi its chief of operations, authorities said. The two suspects are believed to be in Pakistan, the Indian intelligence official said.