“Unless you view risk like Bear Grylls you should avoid flying to places like North Africa, sub-Saharan Africa and other countries with an extremist Islamic presence”

Professor Anthony Glees

Isis has claimed responsibility, but had been unwilling to say how the aircraft had been downed.

Foreign Secretary Philip Hammond said: “If this turns out to be a device planted by an Isil operative or by somebody inspired by Isil then clearly we will have to look again at the level of security we expect to see in airports in areas where Isil is active.

“That may mean additional costs. It may mean additional delays at airports as people check in.’’

Mr Hammond told BBC1’s The Andrew Marr Show the incident could open up the renewed cooperation between the West and Russia over how to tackle Islamic State.

He said Brit tourists waiting to leave Sharm-el-Sheikh could face delays of “two or three days”.

Around 2,600 were yesterday still stuck at the Red Sea resort.

Holidaymakers returning to the UK described chaos with people trampled as they rushed for planes.

They also claimed that swamped security staff carried out only cursory check