Roads remain shut in Sheffield city centre as police continue to negotiate with a man who allegedly has weapons.
The incident at a block of flats in Broad Street has been going on for over 24 hours, with residents evacuated and spending Monday night at a nearby sports centre.
Police said they gained access to the building on Tuesday evening and reunited residents with their pets.
However, the Gateway flats remain evacuated and Sheffield Parkway is closed in both directions between Park Square roundabout and Derek Dooley Way.
Trams and buses have also been disrupted.
The Sheffield Star said thousands of commuters were affected on Tuesday morning, with some spending three hours trying to get to work.
South Yorkshire Police said the man is inside a property and is alleged to have weapons and be “a risk to himself”.
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The incident began at around 7pm on Monday.
“Those evacuated are all cared for and being accommodated with families and friends or in nearby facilities,” said a police statement.
Officers added: “Our aim is to bring the incident to a close safely and get everyone and their families back to their homes as soon as possible.”