Bangladeshi students are demanding answers and action after a military training jet crashed into their school, killing at least 31 people.

Hundreds of students gathered outside the smouldering 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 air force jet crashed near a college in the capital Dhaka on Monday, with emergency services responding to reports of casualties on the ground.