A Transport for London employee has tested positive for coronavirus as the outbreak spreads across the UK.
The staff member works at TfL's traffic control centre at Palestra House in Southwark in a "non-operational role".
His or her colleagues were informed on Monday morning and told it was safe for them to be at work after a deep clean took place.
At least 285 people in the UK have tested positive for Covid-19 and three people have died in hospital amid fears that 100,000 could become infected.
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The TfL worker who caught the flu-like bug works at Palestra House, where staff monitor London's roads and control the capital's Tube network.
It is understood the infected employee does not work in the control centre itself.
A source the Sun: “Staff were only told about the case this morning and were shocked they were still allowed in to the office.
“They are worried but bosses have assured them it is safe for them to be there.”
A Transport for London spokeswoman said: "We are working closely with Public Health England and are following their advice after a member of staff tested positive for Covid-19.
"The safety of our staff and customers is our top priority, so we are taking all necessary precautions and a deep clean has taken place within the building used by the staff member."
The UK's coronavirus total increased to 280 on Monday after Wales reported two more cases.
Prime Minister Boris Johnson chaired an emergency Cobra meeting after a dramatic rise in infections at the weekend.
Ministers were discussing whether to officially move to the "delay" phase - the second of the Government's four-part action plan - and impose "social distancing" measures such as urging to elderly to stay at home.
Culture Secretary Oliver Dowden said cancelling sports events and shutting museums and galleries - measures taken by Italy and other countries - would be "premature".
He told BBC Breakfast: "There's no reason for people either not to attend such events or to cancel them at this stage, but we keep it under review."
More than 100 Britons stuck on a coronavirus-hit cruise ship off the coast of California will soon be allowed to leave the vessel.
Passengers will disembark the Grand Princess from Monday - a process the liner's operator said will take a number of days.
Britons on board have described feeling tired and "fed up", having been confined to their cabins since Thursday.
The ship, which is carrying 21 people who have tested positive for Covid-19, will dock in the port of Oakland on Monday.
