Security and intelligence experts are deeply worried by a new development in suicide bombing, the BBC has learned.
It has emerged that an al-Qaeda bomber who died last month while trying to blow up a Saudi prince in Jeddah had hidden the explosives inside his body.
Only the attacker died, but it is feared that the new development could be copied by others.
Experts say it could have implications for airport security, rendering traditional metal detectors "useless".
Last month's bombing left people wondering how one of the most wanted al-Qaeda operatives in Saudi Arabia could get so close to the prince in charge of counter-terrorism that he was able to blow himself up in the same room.
Western forensic investigators think they have the answer, and it is worrying them profoundly.
The explosives, they believe, were detonated by mobile phone.
Read more @ BBC News
ok... how many other people saw this is a blockbuster a year ago?
Why so serious?
"For too long, we have been a passively tolerant society, saying to our citizens 'as long as you obey the law, we will leave you alone'" - David Cameron, UK Prime Minister. 13 May 2015.