Here's a look at what you need to know about the unsuccessful terrorist bombings on July 21, 2005 in London, England. No one was killed or injured in the attacks.
The attacks took place two weeks after a similar attack killed 52 people and injured more than 700.
The bombs were homemade and were believed to contain white peroxide-based explosive, a description consistent with the highly volatile triacetone triperoxide, or TATP.
July 21, 2005 - Four bombing incidents in London take place almost simultaneously, three on subway trains, one on a bus. Small blasts occur at Warren Street, Oval and Shepherd's Bush stations. Scotland Yard also responds to an "incident" on a bus at Hackney Road and Columbia Road in east London. There are no casualties.
July 23, 2005 - Police recover a fifth undetonated device in a west London park.
July 26, 2005 - Investigators identify the suspects in the July 21 bombings as East African immigrants.
July 27, 2005 - Yassin Hassan Omar, a 24-year-old Somali man with British residency, is one of four men arrested in Birmingham, about 100 miles north of London. Police identify one other suspected bomber, Muktar Said Ibrahim, who was born in Eritrea and became a British citizen in 2003.
July 28, 2005 - Nine men are arrested in the Tooting area of south London, bringing the number of those in custody to 20.
July 29, 2005 - Two of the 7/21 suspects, Muktar Said Ibrahim and Ramzi Mohammad, are captured at the Dalgarno Gardens apartments in London's North Kensington neighborhood. The suspected fourth bomber, an Ethiopian named Hamdi Adus Isaac, is captured in Italy, after Scotland Yard and Italian authorities monitor his cell phone when he travels from London to Rome.
August 3, 2005 - The first person is charged in connection with the July 21 attempted bombings of the London transport system. Ismael Abdurahman, 23, from Kensington, south London, is charged under Section 38 of Britain's Terrorism Act 2000 with failing to report information about a terrorist act to police.
August 7, 2005 - British police announce that a total of five men have now been charged: Muktar Said Ibrahim, 27, attempted murder and conspiracy to murder; Ramzi Mohamed, 23, attempted murder and conspiracy to murder; Manfo Kwaku Asiedu, 32, conspiracy to murder; Siraj Yassin Abdullah Ali, 30, and Wharbi Mohammed, 22, both charged with assisting in evading arrest.
August 6, 2005 - British police have now arrested a total of 39 people in Britain after searching more than a dozen London addresses, plus two locations in Birmingham, in connection with the bombings. Of those, seven have been charged and 10 remain in police custody in connection with the investigation. One man is being held under a European arrest warrant in Rome.
September 22, 2005 - Suspect Hamdi Isaac arrives in Great Britain after being extradited from Italy. Isaac, 27, was arrested July 29 in Rome on a European arrest warrant.
April 28, 2006 - Five suspects, Muktar Said Ibrahim, Ramzi Mohammed, Yassin Omar, Manfo Asiedu, and Hussein Osman, appear via video link at the Central Criminal Court, all responding "not guilty" to the charges of murder, conspiracy, possession of explosives and conspiracy to cause explosions likely to endanger life and property. The indictment for the sixth defendant, Adel Yahya, is postponed until June. He is accused of conspiracy to cause explosions.
July 9, 2007 - Four of the defendants are convicted of conspiracy to commit murder: Muktar Said Ibrahim, Yassin Omar, Ramzi Mohammed, and Hussain Osman.
July 10, 2007 - The jury is dismissed after failing to reach a verdict on the remaining two defendants: Manfo Kwaku Asiedu and Adel Yahya.
November 5, 2007 - Adel Yahya is jailed for six years after pleading guilty to collecting information likely to be used in a terrorist act.
November 20, 2007 - Manfo Asiedu is sentenced to 33 years after admitting to conspiracy to cause explosions.
April 30, 2012 - Internal al Qaeda documents surface providing details that British-subject and al Qaeda operative Rashid Rauf planned the 2005 London bombings carried out by groups led by Mohammed Siddique Khan on July 7 and Muktar Said Ibrahimon July 21.
September 2012 - Manfo Asiedu, Muktar Ibrahim, Yassin Omar and Ramzi Mohammed appeal their convictions to the Criminal Cases Review Commission and Court of Appeal. They contend their devices never would have exploded and their actions were more of a hoax against the invasion of Iraq than terrorism.