A SUSPECT package was discovered at Harrow's Jobcentre Plus at just before midday - requiring a call to the bomb squad.
Police set up a 100m cordon around the office at Kings House in Clarendon Road and told nearby residents to stay indoors, shut their windows and close the curtains.
Shoppers and workers in St Ann's Shopping Centre and St George's Shopping Centre, both in St Ann's Road, and passengers at Harrow Bus Station in College Road, were all evacuated.
A police spokeswoman said: "The explosive ordinance disposal unit turned up and examined the package and confirmed it was non-suspicious.
"It was a bag, inside of which was a book and a box, and it had been left unattended in the job centre. The cordons were lifted at 12.24pm."
The job centre remains closed until 2pm.