AFP•GETTY London was last hit by terror attacks in July 2005

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They made the chilling threats on Twitter after at least 129 people were killed by a series of co-ordinated terror attacks on Paris on Friday night. After gloating about the horror that shocked the world, armchair jihadists tweeted that London could be next. The twisted tweeters also claimed to have two other major capitals in their sights – Washington DC and Rome.

London was last hit by a terror attack in July 2005, when 52 commuters were killed by suicide bombers linked to Islamist group al-Qaeda. But officials have reportedly been working tirelessly to thwart ISIS attacks since the militants declared a caliphate last summer. Last month Andrew Parker, the head of MI5, admitted the security service can "never be confident" in stopping all terror plots against Britain.

AFP French medics evacuate an injured man near to the Bataclan Theater

AFP Armchair jihadists gloated about the attacks on Twitter

Washington DC's police department has deployed extra officers to high-profile locations in the city – including the government's Capitol complex. But a spokeswoman insisted: "There is currently no known threat to the Capitol complex." Security has also been beefed up at the city's French Embassy but a fashion show went ahead as scheduled at the venue on Saturday. Hosts paused the event for a moment of silence to honour the tragic victims of the Paris attacks.

London 7/7 bombings Thu, July 7, 2016 On July 7th 2005 Aldgate, King's Cross, and Marylebone Underground stations, as well as a number 30 bus on Tavistock square, were attacked by a group of terrorists in London. Play slideshow AFP/Getty Images 1 of 60 The wreck of the Number 30 double-decker bus in Tavistock Square, Central London, following the July 7 terrorist attacks

The last terrorist incident in Washington DC was in April 2013, when a man sent letters laced with ricin to Barack Obama. James Dutschke's plot to poison the President was thwarted by officials and he was sentenced to 25 years in prison. He also admitted sending poisoned letters to Republican US Senator Roger Wicker and a Mississippi judge.

AFP French president Francois Hollande at the Stade de France

This summer a knife-wielding fanatic stunned Rome by holding the blade to a tourist's throat, according to reports. He allegedly shouted "Allah is great" and "it is God that sends me" in front of horrified visitors to the Colosseum. Chiara Frisco, 26, said: "I felt myself pulled suddenly into the middle of the crowd. "Then I felt the blade of the knife that he was holding against me. I feared the worst would happen. "I could not see the weapon. The whole attack lasted seconds but I felt a tremendous fear. "The man was yelling like a maniac. Luckily the police came though."