Interesting post on another forum on Feb 2, (I presume GMT time) the day of the incident. It states that.
1. It was a bomb. (Although not officially confirmed at that stage)
2. The route is normally flown by Turkish Airlines, but they did not turn up at HCMM that day nor the previous day "due to a technical problem". The Turkish desk was closed and tickets were hand written. Daallo Airlines would take the passengers on behalf of Turkish Airlines. The passengers were told that Turkish Alirlines would meet them at Djibouti.
3. The aircraft was delayed in taking off, so it is suspected that the device was on a timer and detonated earlier than planned.
http://www.aljazeera.com/news/2016/0...150229224.html