DHAKA — A Bangladesh Air Force F-7 BGI jet crashed into a Dhaka school and college campus on Monday, killing at least 19 and injuring 164 after a mechanical failure shortly after take-off. The pilot, who tried to avoid populated areas, was among the dead. Videos showed fire and chaos at the crash site as rescue crews worked through the wreckage. An investigation has been launched into the tragedy, which also claimed the lives of several students.