Second strike in Sheffield University pension dispute
Staff at the University of Sheffield are taking part in a second 24-hour strike over proposed pension changes after talks to avert action collapsed.
Unions claim the lowest paid workers would see their pensions halved.
The university has said rising costs and low take-up raised questions about the pension scheme's "sustainability".
Cleaners, porters, caterers, clerical staff and security guards are among those who are involved in the walk out which started at from 0700 BST.
The first strike took place on 3 June.
Talks took place on Thursday between the Unite union and university but failed to resolve the dispute.
Unite said the university was proposing to end the final salary scheme for workers on grades one to five and replace it with "an inferior cash balance scheme".