Commuters have been advised not to travel into central London today unless absolutely necessary as transport services struggle to return to normal.

A statement from Transport for London said: "We are encouraging our passengers and staff to remain vigilant, to question who owns items that remain unattended and to report any unattended items or suspicious activity to transport staff or the police."

UNDERGROUND

Near normal service available on Bakerloo, Central, East London Line, Jubilee, Northern, Victoria, Waterloo & City.

Restricted service on the District line, some services on the Piccadilly line and bus services to help on the Northern line.

No service on the Circle and Hammersmith & City lines.

BUSES

London Buses will attempt to run a full service. Only those routes using the roads around Russell Square, Woburn Place and Aldgate High Street will be diverted.

Regular security checks will continue on each bus and at all bus stations and garages for the foreseeable future.

ROADS

Roads around Russell Square, Woburn Place and Aldgate High Street will be closed into Saturday.

The congestion charge has been suspended for Friday but traffic is expected to be very heavy.

Yesterday, commuters faced long delays to get home and roads in and out of London were gridlocked, particularly major routes such as the M4 and M25.

On the M4, air travellers heading for Heathrow were seen to abandon taxis and hotfoot to the airport along the hard shoulder, dragging their suitcases behind them in order not to miss flights.

SCHOOLS

All Westminster schools will be closed on Friday.

For more information, call Transport for London on 020 7222 1234.