Armed police guard the entrance to Lizvale Farm,Navestock near Romford, as they continue to search for Francis O'Donoghue.
Scene of crime officers in white suits are working insidethe gates as police investigate the shooting of two men yesterday.
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It is the fourth time in five years that the London borough has topped the rankings, according to data from the ONS.
Catherine Burke's body was discovered at a house in a quiet street in Muswell Hill last Thursday evening.
Residents said living next to the 40 foot high stinking mound was a 'living nightmare'.