The Metropolitan Police says it's looking into whether the substance sprayed into the face of an officer may have been ammonia. He was attacked when he stopped a moped rider in Battersea yesterday afternoon.
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Handyman Paul Thrower died after two 18-year-olds hacked at him with a 4ft long axe and stabbed him 10 times at a block of flats.
The 34-year-old victim was left with a huge gash across her nose and face. Police need to find a man seen on CCTV.