Around 2,300 police officers were deployed on the city's streets and specialist counter-terror units were flown in.
Foreign Secretary Philip Hammond has said the UK Government "stands ready" to send specialist counter-terrorism police to support the post-attack investigation.
A series of errors during the failed attempts to release the 11 Israelis highlighted the lack of specialist counter-terrorism forces across Europe to deal with well-organised and well-armed groups.
As well as the armed response teams on public patrol, Scotland Yard has specialist counter-terrorism firearms squads who are on call 24 hours a day and trained to confront and stop attackers as a priority over dealing with casualties.
At least three ambulances entered the town of Dammartin-en-Goele Dammartin-en-Goele Dammartin-en-Goeleort and 25 miles north-east of central Paris, shortly before 10.20am, followed by several car loads of balaclava-clad specialist counter-terror officers in unmarked vehicles.
During his training, Cruz was hospitalized twice with dehydration, but he completed the course and in October last year, Cruz and 15 other men from his battalion were picked to serve in the Xatruch taskforce – one of two multi-agency forces in Honduras deployed on specialist counter-narcotics and anti-gang operations.
Critics will say the extra recruits will do little to counter the massive cuts to the regular police, seen by senior police chiefs as the front line in the domestic battle against terrorists, but the government claims the specific need is for specialist counter-terrorism and airport security staff.
Cameron also revealed that he is considering sending body armour and specialist counter-explosive equipment to the Kurds in Iraq, and that Britain will use next month's Nato summit in Wales to press for more action in the United Nations to "help rally support across the international community" for the Kurdish people.
Karen Jones, specialist counter-terrorism prosecutor for the Crown Prosecution Service, said: "These men had dangerous aspirations and whilst the precise targets remained unclear, the potential for damage and loss of life from their plot should not be underestimated.
In addition to warfighting during conventional conflicts, the regiment is also tasked with maintaining a specialist counter-terrorist capability.
Specialist counter-terrorism officers were called to help local police investigate, but Mark Rowley, assistant commissioner at the Metropolitan Police, warned against spreading conspiracy theories.
