Hundreds of students gathered outside the smoldering remains of a school in the Bangladeshi capital on Tuesday to demand answers after a military jet slammed into the campus, killing dozens of children.

A Bangladeshi military training aircraft crashed into the campus of a school in Dhaka, killing the pilot and at least 19 others, mostly students, officials say.

At least 88 people, including children, are being treated in hospital. The government announced a day of mourning, with flags at half-mast and special prayers at all places of worship.