Ireland will come to a standstill tomorrow as in a national day of mourning for the victims of the United States terrorist atrocities.
Banks, businesses, schools and State Departments will all be closed and transport companies will operate a limited Sunday service.
Earlier the Taoiseach Mr Ahern said Irish people were "shocked to the core", added: "We will show our solidarity with the victims, the families, and the people of the United States".
Mr Ahern, and the President Mrs McAleese, will attend an ecumenical service at the Pro-Cathedral in Dublin to mark the day.
Employers are being urged to close their premises in sympathy with all those killed and injured in the attacks. Employees are entitled to a paid day off.
Those requiring further information on the matter can contact the Employment Rights Information Unit at the Department of Enterprise, Trade and Employment at low-call telephone numbers 1890-201615 or 1890-220222 or 01- 6313131. The service is available from 9.30 this morning until 8.00 p.m.
A Book of Condolences has been opened at Government Buildings on Merrion Street, between 10 a.m. and 4 p.m. tomorrow and Saturday.
People can also sign their expressions of sympathy electronically at www.thetaoiseach.com.