BRITISH cities are on red alert today as security services brace for further Islamic State (ISIS) bomb plots designed to follow up the horrific Brussels massacre.
Forces across the country are preparing for the possibility of a fresh terror attack on UK soil after evil jihadis killed at least 31 people and wounded 270 more in the Belgian capital.
More armed police have been drafted into British airports whilst there is also an increased police presence at major transport hubs including train stations.
After the crazed Islamists issued a chilling warning that Britain could be next, Express.co.uk looks at some of the UK cities most at risk of a terrorist attack.
LONDON
The capital is likely to be the number one target should ISIS militants attempt to strike Britain.
Earlier today two Britons inspired by the hate group were found guilty of plotting to murder policemen and soldiers in a drive-by-shooting attack.
Suhaib Majeed, 21, and ringleader Tarik Hassane, 22, wanted to spread terror and panic by striking law enforcement in the heart of the capital.
Security services are known to have foiled several other plots targeting London, including planned bombings on the London Underground and the Westfield shopping centre.
The capital is one of the heaviest protected cities in the world, however, with counter-terrorism officers working around the clock to counter homegrown extremism.
MANCHESTER
Michael Fallon has named Manchester, which is Britain's third largest city, as a likely target for ISIS fanatics.
The Defence Secretary issued a chilling warning that Islamist maniacs could target shopping centres in the northern Metropolis, which attracts shoppers from miles around.
In November extremist student Abid Naseer was jailed for 40 years over his failed plot to bomb a series of Manchester landmarks, including the city centre Arndale shopping centre.
The city is also served by a busy international airport, where security has been now been beefed up in light of the Brussels attack.
GLASGOW
Scotland's biggest city was also raised by Mr Fallon as a possible target for Islamist maniacs.
The city was thrown into panic last summer after it emerged that a female ISIS bomber was on the large and was plotting to bomb a parade commemorating Victory in Japan (VJ) day.
British ISIS recruiter Sally Jones, originally from Kent, told a journalist that the extremist was on the large, prompting fears of an imminent homegrown attack in the city.
Glasgow boasts numerous shopping centres and Scotland's two biggest football clubs — Celtic and Rangers — with security experts previously warning sporting venues could be targeted by terrorists.
In 2007 Islamist extremists Bilal Abdullah and Kafeel Ahmed planned and carried out a botched suicide bombing attack on the city's international airport.
BRISTOL
A recent report by risk experts Verisk Maplecroft named Bristol, the de facto capital of the South West, as the mainland British city the most at risk of suffering a terror attack ahead of London.
The metropolitan university city was also pinpointed by Chris Phillips, the former head of the National Counter Terrorism Security Office, as a possible target for jihadists.
Mr Phillips said terrorists could attack soft targets in Bristol in the belief that they city is less well protected than the capital.
Back in 2009 police foiled a plot by former public schoolboy Isa Ibrahim, then 20, who made a suicide bomb vest and planned to attack the city's Broadmead shopping centre.
PORTSMOUTH
Mr Phillips also said that Portsmouth, which has been the scene of numerous recent terror arrests, could be at risk of an Islamist attack.
The city is the historic home of the Royal Navy, and its large port and naval docks could be prized targets for ISIS maniacs.
In November authorities announced they were launching a root and branch review into security surrounding the south coast city in light of the horrific Paris massacre.
The same month Portsmouth brothers Tuhin Shahensha, 26, and Mustakim Jaman, 23, were jailed for six years each for preparing terrorist acts over their help for Britons trying to travel to Syria.
PROVINCIAL TOWNS
Aside from major cities, there are also increasing fears that terrorists could target smaller provincial towns away from the security services' spotlight.
In January the Sunday Express revealed how the RAF foiled a terrorist plot targeting Brighton, Bath and Ipswich after intercepting commercial airline pilots discussing targets on their radios.
Scotland Yard has also warned that smaller urban centres are vulnerable to ISIS attacks because of a chronic lack of armed officers outside London.
And one police sharpshooter in Surrey said the British public was wildly over confident about the authorities’ ability to stop Islamist gunmen, claiming that many forces are “not equipped to deal with active shooters”.