Leicester City Council says two graffiti writers have cost it £100,000 in just six-months.
'Kase' and 'SO12', have plastered thousands of so called 'tags' across the city. The council is offering £500 for information.
Clearing the graffiti from the past 6 months alone has already used up two fifths of the council's cleaning budget.
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Steven Banford and other youths threw stones at them and verbally and racially abused them in the street.