Turf wars  Rosie Cowan looks for some answers to British inner-
city violence in Graeme McLagan's Guns and Gangs Guns and Gangs
by Graeme McLagan  Guns and Gangs: Inside Black Gun Crime by
Graeme McLagan 288pp, Allison & Busby, £17.99  A young mother
shot on her bed as her two children cowered under the mattress,
a teenage girl killed by her boyfriend in a deadly game of
Russian roulette, a 14-year-old boy gunned down as he queued for
a takeaway. These shocking stories are not from some distant
battle zone, but happened in modern Britain, where gun crime,
particularly so-called "black-on-black" shooting, has forced its
way up the police agenda in the past two decades to become the
second biggest headache for law enforcement agencies after the
terrorist threat.  In Guns and Gangs, Graeme McLagan, an
investigative journalist who previously exposed corruption at
Scotland Yard in Bent Coppers, turns his focus to this under-
reported and under-analysed phenomenon, the reasons behind it
and what is being done to comb