MYTH Haroon Rashid Aswat, a British-born Muslim who grew up in West Yorkshire, was reported to be the mastermind behind the July 7 suicide bombings and had been arrested in Pakistan.
REALITY He was never in Pakistan but was eventually detained in Zambia. Scotland Yard does not view him as a key player in the July 7 attacks.
MYTH A known terrorist was widely reported to have slipped into Britain to "mastermind" the July 7 London bombings.
REALITY The man was an innocent Pakistani with a similar name to a suspected al-Qa'ida figure on a watch list of foreign security agencies.
MYTH Police had identified a "fifth" suicide bomber connected to the July 7 team who was caught on CCTV at Luton railway station but who was never seen again.
REALITY No one was identified as a fifth member.
MYTH One or two of the men alleged to be responsible for the July 21 attacks were at a white-water rafting centre at the same time as two of the July 7 suicide bombers, Shahzad Tanweer and Mohammad Sidique Khan.
REALITY It is now thought to be a case of mistaken identity.
MYTH US intelligence claimed Germaine Lindsay, 19, who carried out the King's Cross attack, was on a British watch list.
REALITY The "fourth" bomber was wrongly identified in the US as Lindsay Jermaine, who had a similar name to a terrorist suspect.