The Bank of England has frozen the assets of 19 people and named them as people arrested in connection with an alleged plot to bomb British passenger jets.

A Treasury statement read: "On the advice of the police and security services, the Treasury has instructed the Bank of England to issue notices to effect a freeze of the assets of a number of individuals arrested in yesterday's operations."

Twenty-four people were arrested on Thursday in police raids in London, the south of England and Birmingham after a police investigation into a plot to blow up several trans-Atlantic airliners.

The bank released the names and posted them on its website.

The oldest person on the list is 35 and the youngest, is 17.Most of those named in the list were London residents.

The police are expected to ask a judge for permission to hold the suspects for up to 28 days without charge, under new anti-terrorism powers that came into force last month. They must seek permission within 48 hours of the arrests.

British police gave no details of the people they had arrested, but the US homeland security department said all were British citizens.

Pakistan said it played a role in thwarting the suspected plot and had arrested an undisclosed number of people. A senior government official, speaking on condition of anonymity, said two of the men arrested were British nationals of Pakistani origin.

They were arrested in the southern city of Karachi and in Lahore last week.

In Britain, new security measures remained in place at airports on Friday. Airports were jammed on Thursday and scores of flights were cancelled.

British Airways said it expected to cancel about 40% of its short-haul and 25% of its long-haul flights from London's Heathrow airport on Friday.

In Britain, all hand luggage was banned and passengers were allowed on board with only a single clear plastic bag containing items from an official list. In the US, authorities banned liquids and gels from bags being carried on to aircraft.

Airport authorities told people to stay home if they could.

News of the suspected plot affected financial markets. Shares in European airlines fell. The pound fell against the dollar and the euro. Oil fell to below 76 US dollar a barrel on fears the security threat might slow growth worldwide and cut oil demand.

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British police.