Londoners will get their first chance from this week to buy or rent a home at East Village E20, London's newest neighbourhood on the site of the former Athletes Village.
The 356 homes for rent with a 20% discount on market rate, and another 348 available through shared ownership will be available from Triathlon Homes and will be a mix of one, two and three bedroom apartments.
More top news
Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.