Tributes have been paid to the man who oversaw the creation of London 2012's widely-praised parklands.
John Hopkins has died suddenly at the age of 59.
He was the landscape architect in charge of transforming more than 250 acres of the Olympic Park between 2007 and 2011.
Mr Hopkins - who studied at the university of Greenwich - died of natural causes at his home in America.
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Some platforms have been taken out of service with disruption expected to continue until the end of the day.