A stretch of the Tyne and Wear Metro, which was due to reopen this morning after a month-long closure, has closed due to "unforeseen circumstances".
There are no trains running between Haymarket, Regent Centre and Four Lane Ends.
The track and drainage has been upgraded over the summer and trains were due to begin from 0530 this morning. A bus replacement service is now running instead.
More top news
Veterans, cadets, dignitaries and serving Northumberland Fusiliers have paid tribute to those killed at the Battle of the Somme
Clear spells. Showers. Brisk winds. Sunday looks like the better day
Two men whose grandfathers fought in the Tyneside Irish battalion and died together on the Somme have returned to visit their graves.