LONDON - London's famous 'Gherkin' building has been evacuated over a fire alarm, a day after a terror attack near the UK Parliament in the city.

London fire department said four fire engines were at the Gherkin to investigate reports of smoke in the building's basement.

The City of London police said on Thursday they were investigating reports of smoke at the skyscraper but said it was not a "police or security incident".

"No police or security incident @StMaryAxe but @LondonFire crews investigating reports of smoke in a basement room #
Gherkin," City of London police said on Twitter.

This story is developing.