Eight men were remanded in custody on Tuesday to appear at the Old Bailey next month on charges relating to an alleged conspiracy to blow up transatlantic aircraft with improvised explosives.

A further three defendants charged with lesser offences were remanded in custody to appear again before City of Westminster magistrates.

The 11 are the first to be charged over the alleged terror plot, which has triggered heavy airport security since it was disclosed by the authorities on August 10.

At the City of Westminster magistrates court, district judge Timothy Workman ordered the eight men charged with the most serious offences to appear at the Old Bailey on September 4.

The eight were charged on Monday with involvement in a conspiracy to murder between January 1 and August 10, when police made a series of raids and arrests over the alleged plot to bring down commercial aircraft travelling from Britain to the US. The men face a further charge, under the Terrorism Act 2006, that they planned to smuggle the components of improvised explosives on to aircraft to assemble and detonate on board.

The men, who appeared flanked by security guards, spoke briefly, mainly to confirm their names and ages.

Five of the eight – Umar Islam, 28, Arafat Waheed Khan, 25, Ahmed Abdullah Ali, 25, Waheed Zaman, 22, and Adam Khatib, 19 – are from east London. The other three are Ibrahim Savant, 25, from north London, Assad Ali Sarwar, 26, from High Wycombe and Tanvir Hussain, 25, of no fixed abode.

No pleas were entered by the defendants on Tuesday, although Mohammed Zeb, acting for Mr Hussain, said: “All allegations are denied.”

Two other defendants – Cossar Ali, 24, from east London, and Mehran Hussain, 23, from Chingford – are accused of failing to disclose “as soon as reasonably practicable” information that they knew or believed might have been of “material assistance” in stopping another person carrying out an act of terrorism. An application for bail made on behalf of Ms Ali, who has an eight-month old baby, was denied.

A 17-year-old, who cannot be named for legal reasons, faces a charge under the Terrorism Act 2000 of possessing articles useful to a person preparing acts of terrorism. It is alleged he had a book on improvised explosive devices, suicide notes and wills with the identities of people prepared to commit terrorism and a map of Afghanistan including information likely to be useful to someone committing or preparing an act of terrorism.

The youth, Cossar Ali and Mehran Hussain were remanded in custody until August 29. Lawyers for the three indicated they would be pleading not guilty.

The police are still holding a further 11 people in custody.

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