Sydney Police have confirmed multiple operations are underway at a number of Sydney schools.

There’s reports Hunters Hill High, Sydney Girls High, Randwick, Mosman and Riverside are the schools affected today.

UPDATE: Riverside Girls High School is one of several Sydney schools in lockdown. https://t.co/CSztE7YQ2M pic.twitter.com/69f20BOmj8

— 7News Yahoo7 (@Y7News) February 1, 2016

It comes after a similar situation on Friday in which threats were made to a number of schools - prompting a stern warning from police that those responsible had committed a crime.

Police operation at schools across #Sydney continues. pic.twitter.com/0baP7saaZ2

— NSW Police (@nswpolice) February 1, 2016