Canadian Prime Minister Justin Trudeau expressed grief over the incident and condemned the "hateful and heinous" act.
Lord's, cricket's most famous ground, is set for a 200 million pounds redevelopment, owners the Marylebone Cricket Club (MCC) announced on Wednesday.
Eight people were arrested on suspicion of making false instruments and facilitation of illegal immigrants into the UK while seven were arrested in connection with other immigration offences.
The suspects, aged 37 and 41, both from London, were being interviewed at separate police stations last night, seven months after the killing.
British police fear there may have been a fifth suicide bomber
They may have travelled there to join the dreaded Islamic State militant group.
Three Indian-origin Muslim siblings, including two hijab-clad girls, have claimed that they were hauled off a plane at an airport in London and questioned on the tarmac by British policemen after a passenger accused them of being ISIS supporters.
Prime Minister Narendra Modi on Saturday inaugurated a memorial in London dedicated to Dr B R Ambedkar over two months after India acquired the bungalow where the Dalit icon and architect of India's Constitution lived as a student in the 1920s.