LONDON — This past week marked the 10th anniversary of the 7/7 attacks in London. On July 7, 2005, 52 people were killed when four suicide bombers detonated explosive devices on subways and buses. There were commemorations across the nation to honor the victims, including a ceremony of remembrance at the 7/7 memorial in Hyde Park and a service at St. Paul’s Cathedral.

The 10 years that have elapsed have perhaps softened the original shock, which was not just at the death toll but at the realization that the bombers were not foreigners but British citizens steeped in this country’s life and culture. In the decade since, the homegrown jihadi has become almost a fixture in British life.

There has been no repeat of the bombings, but the emergence of the Islamic State in Iraq and Syria has transformed the character of domestic jihadism. Some 700 British Muslims are believed to have joined the Islamic State — not just young men like those who carried out the 7/7 attacks, but mothers, grandfathers, schoolgirls and doctors.

Three days before the anniversary, 12 members of the Mannan family from Luton, a town about 30 miles north of London, put out a statement explaining why they had traveled to Islamic State territory in Syria. The family, of Bangladeshi origin, claimed to be happy to be living in “a land that is free from the corruption and oppression of man-made law and is governed by the Shariah,” referring to Islamic law.