- Tenth of Britain's Islamist terrorists come from five council wards in Birmingham
- Study found London and Birmingham individuals are dominant among offenders
- Between 1998-2015 beheadings and stabbings increased from 4% to 44%
The shocking report also reveals that Islamist-related offences have doubled in the last five years, while the rate of beheadings and stabbings has increased eleven-fold.
London and Birmingham have been identified as housing the most offenders, with East London home to half of London-based offenders (22 per cent overall), the most common boroughs being Tower Hamlets, Newham and Waltham Forest.
The shocking report reveals that Islamist-related offences in the UK have doubled in the last five years. Pictured, anti-terror police on duty today at Vauxhall Station in London
The study identifies all Islamism-inspired terrorism convictions and suicide attacks in the UK between 1998 and 2015.
The 1,000-page report, published by the Hannah Stuart and the Henry Jackson Society, says Islamism-inspired terrorism remains the principal terrorism threat to both the United Kingdom and British interests overseas.
London was the place of residence at the time of arrest in 43 per cent of Islamism-related offences.
The second most common region was the West Midlands, with 18 per cent of arrests - 14 per cent of which came from Birmingham.
The report claims: 'Offenders lived in neighbourhoods with both a higher than average relative deprivation and Muslim population.'
According to the society, there were 264 convictions between 1998 and 2015 involving 253 British or foreign nationals.
And the role of women in Islamism-inspired terrorism has trebled – from four per cent in the years 1998-2010, to 11 per cent in 2011-2015.
Some 72 per cent of those committing offences are British nationals, 47 per cent are in full time work or education and 76 per cent have been known to the authorities.
The authors say 16 per cent had converted to Islam, and 22 per cent had attended terrorist training camps.
The report states: 'The 269 Islamism-related offences (IROs) comprise 135 distinct terrorism cases.
'The rate of offending increased in the five-year period between 2011 and 2015 compared to the 13-year period between 1998 and 2010.
'IROs doubled in five years (increasing from an average of 12 to 23 per year) while distinct terrorism cases almost tripled (from five per year to 14 per year).'