A Bangladeshi military training aircraft crashed into the campus of a school in Dhaka, killing the pilot and at least 18 others, mostly students, officials say.

A Bangladesh Air Force training aircraft crashed into a school campus in northern Dhaka on Monday, killing at least 16 people, including its pilot, and injuring dozens, officials and local media said.

More than 160 people were injured after the training aircraft crashed because of a mechanical error, military officials said. The country’s interim leader called the loss “irreparable.”