Eleven of 23 people arrested in England ten days ago over an alleged plane bomb plot have been charged.

The charges include conspiracy to murder and preparing acts of terrorism.

Eleven others are still in custody and a woman has been released.

At news conference to announced the charges, Deputy Assistant Commissioner Peter Clarke revealed that the police investigation had uncovered bomb making equipment including chemicals and electrical components and so-called martyrdom videos.

News that at least one of the suspects had already been charged had come earlier at the High Court in London, where lawyers for one of the detainees were about to begin legal action over her detention.

British police had been questioning 23 suspects over the alleged plot.

Detectives had until later today to question two of the suspects and until Wednesday to question the others before applying for a warrant to hold them for longer.

Irish link in Holyhead arrests

It has emerged that one of two people arrested at Holyhead in Wales last week may have travelled from Ireland on a ferry.

Welsh police are continuing to question the man and woman who were arrested at Holyhead Port under the Terrorism Act ten days ago.

North Wales Police said the 47-year old man and 44-year old woman were originally from Algeria but would not confirm whether they were British or Irish citizens.

A spokesperson said the arrests were not directly linked to the alleged foiled bomb plot to blow up planes.

The spokesperson said no threat was posed to passengers and staff at the port as a result of the arrests.

It is understood one of the individuals travelled from Ireland on a ferry and the other arrived at the port independently.

Last Thursday, police were given more time to question the pair.

Security has since been stepped up at Holyhead Port, which is the main ferry terminal for sea services between Ireland and north Wales.