Three youths have been arrested and bailed over the death of Seydou Diarrassouba on London's Oxford Street during the Boxing Day sales.
The three - two aged 16 and one aged 20 - were held at separate London police stations and bailed until mid-January.
The 18-year-old was stabbed after a fight began in the Foot Locker sports shop near Bond Street Tube station on Monday.
Later, his family praised a "loving son and brother".
The homes of 20 suspected gang members were raided on Friday to "quell" related tensions, police said. A further 11 individuals have also been arrested.
Police have targeted suspected gang members in Merton, Wandsworth and Southwark.
Mr Diarrassouba's family said in a statement: "A simple shopping trip has turned into a complete nightmare for our whole family.
"Whoever took his life took our backbone away. Seydou kept us upright and now we feel weak as we have lost a very special part of us."
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