European airports and other transport hubs are on 'high alert' amid fears of a spate of attacks by Algerian female suicide bombers, Israeli intelligence website Debka said Wednesday, citing counter terrorism sources.

Security has been stepped up at London's Heathrow, Amsterdam's Schiphol and airports in Berlin and Rome, as well as at major European railway and underground stations, Debka said.

The commander of French police and security services Frederic Pechenard said on radio Wednesday they had 'serious evidence coming from reliable intelligence sources telling us there is a risk of a major attack'.

Al-Qaida in North Africa was targeting France in particular, he said.

The threat included 'the assassination of an important figure or an attempted mass casualty attack on a crowded public area like a metro train or department store', Pechenard said.

One of the main prospective targets for the suicide bombings is reportedly the Gare du Nord station in Paris, where trains depart for London and cities in Italy, Belgium and Switzerland.

Besides French intelligence, Debka said the 'reliable sources' referred to by Pechenard were an Algerian intelligence service, Algerian military intelligence, a Moroccan agency and the US agency which coordinates anti-terror activities against Al-Qaeda in the Horn of Africa and the Sahara region.