Indian authorities say the horrific Mumbai train bombings that killed more than 200 people were masterminded by Pakistan’s radical Islamic intelligence service, the notorious ISI.

MUMBAI, India - The police officer leading the investigation into train bombings that killed more than 200 people in the Indian city of Mumbai in July accused Pakistan’s spy agency on Saturday of masterminding the attack.

Tariq Azim, Pakistan’s minister of state for information, denied the claim, calling it “sad and unfortunate.”

“We reject this allegation, and demand that India should provide us any evidence, if they have,” Azim told The Associated Press.

Mumbai police Commissioner A.N. Roy said an intensive investigation that included using truth serum on suspects revealed that Pakistan’s top spy agency had “masterminded” the bombings. Roy said Pakistan’s Directorate of Inter Services Intelligence, or ISI, began planning the attacks in March and later provided training to those who carried out the bombings in Bahawalpur, Pakistan.

“The terror plot was ISI sponsored and executed by Lashkar-e-Tayyaba operatives with help from the Students Islamic Movement of India,” Roy said at a news conference to announce the completion of the investigation.

Lashkar is a Pakistan-based Islamic militant group, while the Students Islamic Movement of India, or SIMI, is a banned Islamic group.