Ethel Winstanley who lives opposite said she was "shocked and saddened" by the news that three children had been found dead at the property.
Joy Devis, who lives a few doors away and knew the family, said she was devastated, describing them as a "lovely family".
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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.