Twitter user Helen True shared this photograph of emergency services attending London Bridge station where four people were taken ill.
Network Rail and TfL dismissed reports of a gas leak and said that overground and underground train services were running as normal.
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The animal is believed to have been attacked with metal bars, knives and rocks and later died of his injuries.
More than 20,000 allegations of abuse by care home workers have been made in the last three years, figures show.