Britain will pay silent homage Tuesday to the 52 victims of the 2005 London bombings, with thoughts inevitably also turning to the 30 Britons killed in Tunisia last month in a horrific reminder of the Islamist threat. In the 10 years between the two attacks, Britain has beefed up anti-terror legislation and stepped up its emergency preparedness, but the number of fighters travelling to join militants has multiplied.

The four suicide bombers of July 7, 2005, who killed 52 people, said they were inspired by Al-Qaeda, while the Tunisian gun massacre of June 26 in which 38 tourists died was claimed by ISIS.

The threat has evolved and militant attacks like the one in Tunisia risk inspiring copycat action in Western countries, Rosemont said.

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