Girl and her friends - including her brother - seen throwing a firecracker down upstairs . A huge explosion sends the Chinese girl tumbling down into the sewer . police eventually haul the young girl out but she later dies in hospital .
Girl and two boys - one her brother - seen putting a firecracker down drain . A huge explosion sends the Chinese girl tumbling down into the sewer . Firefighters eventually haul the young girl out but she later died in hospital .