Two English Defence League leaders were arrested today after attempting to visit the spot where Drummer Lee Rigby was killed.
Tommy Robinson and Kevin Carroll were detained on suspicion of obstructing police as they made their way to Woolwich.
The Metropolitan Police had already banned the march, as Ria Chatterjee reports:
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Official readings are recorded three metres in the air but a study found levels of nitrogen dioxide (NO2) were higher at pushchair level.
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Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.