Jenny Reeves (@Jennyflyer1) was one of the first to post a picture on Twitter.
And Transport for London sounded the all-clear after the "invasion" had been averted.
The filming of Doctor Who has finished at Westminster Bridge, the Daleks are in the process of being removed.
More top news
The City of London Corporation have axed a controversial scheme to allow hunting in Epping after reports of deer being 'disembowelled'.
A burst water main caused serious flooding in south London this morning with businesses and homes left submerged in water.
Campaigners have vowed to block the building of a £50 million Holocaust memorial that is due to be built next to Parliament.