A runaway seven-year-old girl slipped through security checks at Geneva's airport and onto a plane without a ticket before being spotted by a crew member and handed over to police, officials said on Wednesday.

French authorities have tightened security at Paris airports since last year's attacks in the capital, with thousands of border police officers, customs personnel, soldiers and private guards patrolling daily in the three airports serving the capital

Marks and Spencer's bras are apparently setting off security scanners at airports.

Airport security around the world will have to be overhauled if it is confirmed the Russian airliner crash in the Sinai was caused by an Islamic State bomb, British foreign secretary Philip Hammond has warned.