A minute's silence will be observed in all Darlington Borough Council offices at 1.46pm - symbolising the time when the first plane hit the World Trade Centre - while the Town Hall flag will be flown at half mast.

The town's Holy Trinity Church will be open at various times during the day, with a prayer for the victims and families at Eucharist, at 7.15pm.

At Durham Cathedral, all four regular services at 7.30am, 8.45am, 12.30pm and 5.15pm will remember those affected. There will also be a short period of reflection following noon prayers.

Staff at all Durham County Council premises have been asked to observe a minute's silence at 1.46pm.

In Newcastle, a memorial service by the Fire and Rescue Service will be held in Christ Church with St Ann's, Simpson Terrace, Shieldfield, at 12.30pm.

St Mary's Catholic Cathedral, Clayton Street West, will hold Mass at 8am and 12.05pm.

The Reverend Kit Widdows is holding a multi-faith service at St Thomas The Martyr Church, Haymarket, at 4pm.

St Nicholas' Cathedral, St Thomas the Martyr and St Mary's RC Church, the Catholic cathedral, will be open all day for prayers and lighting of candles.

Newcastle City Council staff have been invited to observe a one-minute silence at 1.46pm, following the ringing of the Carillon bells.

St John's at Castleside, Consett, will be open all day with a Eucharist Communion at 9.30am.

St John's, in Birtley, near Chester-le-Street, will hold a special morning service at 9.30am, as well as a midday prayer.

In County Durham, Shildon Chamber of Trade is calling for people in the town to take part in a two-minute silence at 11am. St Mary's and St Stephen's, Wolsingham, will hold a two-minute silence at 1.45pm.

Lumley Castle, near Chester-le-Street, will be flying the American flag from the south-west turret.

Victims will be remembered at Washington Old Hall, Washington, with a short ceremony at 11.30am.

In Sunderland, the city council will fly America's flag alongside the Union flag at half-mast, while an area at the Cenotaph in Burdon Road will be set aside for those wishing to lay floral tributes.

In York, the Minster will host a memorial service at noon, attended by the Lord Mayor, Councillor David Horton. City of York Council workers will observe a minute's silence at 1.46pm.

Staff and passengers at York Station will also observe the post-lunchtime silence with public announcements made to advise people when it is due to start. A Railtrack spokeswoman said: "Trains are scheduled to leave at that time, but there will not be any announcements over loudspeaker systems during the silence."

Staff at Marks and Spencer two stores in York will not process transactions during the silence, a company spokeswoman said.

In Harrogate, the borough council has arranged for a maroon to be fired from the main council offices, in Crescent Gardens, which will be followed by a minute of silence. A service of memorial will also be held at the chapel at Menwith Hill American spy-base, from 1.40pm.

North Yorkshire Fire and Rescue Service personnel are also expected to fall silent to remember the atrocity.

In Middlesbrough, flags will be flying at half-mast at Cleveland Fire Brigade headquarters and all 15 fire stations, with a full turnout of appliances and a parade of all crews called as a mark of respect at 1.46pm.

A lone fire engine bell will signal the start of one minute's silence in the centre of Middlesbrough, while the borough council's speaker, Coun Ken Hall, will join council staff and firefighters for a tribute to the victims on The Boulevard, outside the civic buildings, at 1.46pm.

Councillors Eric Jackson and Brenda Forster, the Mayor and Mayoress respectively of Redcar and Cleveland Borough Council, will lead a minute's silence with council staff outside Eston Town Hall at the same time. The pair will also attend a 10.30am memorial service at Zetland Park Methodist Church, Redcar.