Well the Daily Mail say it was probably pikeys high on ASBOs:
www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=354944&in_page_id=1770
( Nimble Colin camera-wrangling, globe-trotting whisky enthusiast, Thu 7 Jul 2005, 10:41, archived)

Not single mother asylum seekers
who cause cancer?
( Rev. A-MOL is lurking around these parts again, Thu 7 Jul 2005, 10:42, archived)

Yes,
with HOODIES.
( Nimble Colin camera-wrangling, globe-trotting whisky enthusiast, Thu 7 Jul 2005, 10:44, archived)

The phrase "covered in blood" occurs three times in that article.
Nice to see they're not scaremongering.
( Newington, Thu 7 Jul 2005, 11:15, archived)