WASHINGTON (Reuters) – The CIA obstructed inquiries into its role in the shooting down of an aircraft carrying a family of U.S. missionaries in Peru in 2001, the agency's inspector general has concluded.

The inspector-general's report said a CIA-backed program in Peru targeting drug runners was so poorly run that many suspect aircraft were shot down by Peruvian air force jets without proper checks being made first.

Unclassified portions of the report were made public for the first time..