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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Council workers uncovered the AK-74 concealed in the undergrowth.
The thief, who used a walking stick, was helped by a man who disabled the lock before pushing the woman away.
More than 40,000 new property millionaires have been created across Britain this year so far amid rising house prices.