Another British Muslim from Portsmouth is killed fighting with Islamic State militants, in the Syrian Kurdish town of Kobani.
His family have released a statement saying he had a “good heart” and was trying to “help Syrians”.
They say they had no idea he had intended to go to Syria.
Hassan has been due to start at Surrey University before he left. The teenager, who had been privately educated at a Catholic school in Hampshire, had wanted to study International Politics.
Instead, it’s believed he is now the 24th British Muslim to have been killed in the conflict. Research suggests one Brit has been killed in Syria and Iraq every three weeks since the conflict began.
Three of the group that Hassan travelled with are now dead, including Iftikhar Jaman. The only one of the group who came home to the UK, Mashudur Choudhury was convicted of terror offences and jailed.
Hassan’s family have suggested he may have wanted to come home, but was afraid he too would have faced arrest here.