DOZENS of people are feared dead in London today after a serious of explosions ripped through the heart of the capital.As Suffolk families desperately sought news of commuters from the county, Metropolitan police commissioner Sir Ian Blair said he believed the capital had come under "a co-ordinated terrorist attack.

DOZENS of people are feared dead in London today after a serious of explosions ripped through the heart of the capital.

As Suffolk families desperately sought news of commuters from the county, Metropolitan police commissioner Sir Ian Blair said he believed the capital had come under "a co-ordinated terrorist attack."

The blasts shattered the euphoria surrounding London's victorious Olympic bid.

A day of carnage in the capital saw:

A tourist bus blown up at Tavistock Square near Russell Square.

Tube bombs at Aldgate East, Moorgate, Russell Square, Edgware Road, and Kings Cross.

A bomb explosion at Houndsditch, just outside Liverpool Street station.

Security experts today said the bombings were almost certain the work of Al Quaida – there were reports today that the terrorist group had claimed responsibility in radio messages monitored in the middle east.

The tube network took the brunt with explosions reported at stations across the network.

Two people were reported dead in the blast at Aldgate East station near Liverpool Street – but police warned that the death toll was likely to increase significantly.

Liverpool Street station itself was turned into a makeshift casualty department with paramedics treating people on the concourse.

People were this afternoon still reported trapped in tube trains at Kings Cross and the mainline station platforms were turned into makeshift operating theatres.

Emergency services were also reported to have been called to Leicester Square tube station.

The capital ground to a halt as its transport network closed down. Trains from East Anglia were stopped at Colchester as stations across the capital were evacuated.

People were advised to stay away from central London today – and Buckingham Palace was sealed off.

Initial reports suggested that the tube blasts had been caused by a power surge – but it quickly became clear that the capital had fallen victim to a major terrorist campaign.

Union officials blamed the Tube blasts on a series of bombs.

The police commissioner said there were indications that explosives had been used in at least one of the explosions.

Sir Ian said: "We have been on a very high state of alert. Of course if there had been a specific warning we would have dealt with it.

"We are not aware of any warning at the moment.

"We are concerned that this is a co-ordinated attack. We are aware that at

least one of the sites certainly does contain indications of explosives.

"While it is a confused situation - it must be a confused situation with

multiple sites like this - co-ordinated effort is slowly bringing order out of

the chaos.

"The Metropolitan Police is co-ordinating this effort and within a matter of

hours peace will be brought to the streets of London and we will know exactly what we are dealing with."

AS emergency services in London reacted to today's blasts, other potential terrorist targets were put on alert across the country.

Among local potential targets are the two nuclear power stations at Sizewell on the Suffolk coast.

A spokesman for Sizewell B said: "British Energy does not comment on specific security issues at any of its eight nuclear stations.

"Like all civil nuclear facilities in the UK, British Energy power stations employ detailed security arrangements with the security regulator – the Office for Civil Nuclear Security."

A spokesman said: "We are keeping closely in touch with the appropriate government agencies and are following their advice."