Hong Kong's metro lines partially resumed services on Sunday after violent protests in the city forced authorities to shut it down for a day.
However, some of the busy stations remained closed and services shortened by three hours as authorities braced for more demonstrations later in the day.
Hong Kong's rail operator said several stations needed work after protestors vandalised them.
On Saturday, hundreds of anti-government protesters defied the facemask ban and took to the streets.
Violent protests erupted across the city on Friday, hours after leader Carrie Lam invoked a facemask ban to curb months of unrest.

Sydney Airport flights disrupted due to air traffic controller shortage
Fire in rebel-held east Congo kills 24 schoolchildren
Trump says he does not regret Iran war despite potential impact on elections
Trump touts $5,000 payout if Republicans win as Vance waits in wings
Search expands after Philippine ferry fire kills five and leaves dozens missing
Trump says Iran war to end after US midterm elections
Cargo vessel fire at east China shipyard kills 25
US military says it struck vessel in Caribbean, killing 3
