DHAKA, July 22 (Reuters) - National mourning turned to anger in Bangladesh on Tuesday as the death toll from a fighter jet crash into a school in Dhaka jumped to 31, sparking protests by hundreds of students against the interim government in a country gripped by instability.

Interim government announces day of national mourning after 31 killed and more than 170 others injured in Dhaka crash.

At least 27 people were killed after a Bangladesh Air Force training jet crashed into a college and school campus in Dhaka, officials said, with 88 people, including children, being treated in hospital.