An official inquiry found that MI5, Britain's domestic intelligence agency, didn't act quickly enough on information that provided an opportunity to prevent the attack.
Pierre Kattar edited the pictures for an NPR story about two of the teenagers killed in the Sept. 30 attack. On Oct. 10, he went to a demonstration in Rome and made an unexpected connection.
Suicide bombings have been rare in the Iraqi capital since the country's military pushed out the Islamic State in 2017. The last such attack occurred three years ago.
Afghanistan's interior ministry said at least 57 others were wounded in the bombing outside of an education center in a heavily Shiite neighborhood in Kabul.
