Mick Philpott, 55, and his wife Mairead, 31, broke down in tears at a press conference two weeks ago, just days after their six children were killed in an arson attack on their home.
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The signs were encouraging to commuters going about the transport network the day after a terror attack in Westminster.
Faith leaders from across London say religious communities will "stand together" in the wake of the Westminster terror attack.
Pc Keith Palmer was among the three people killed yesterday in the Westminster terror attack.