Aminur Nazir Khan, who's nineteen, will appear at Thames Magistrates' Court today.
He is charged with the murder of 16-year-old Ajmol Alom who died of a stab wound to his thigh.
Detectives have also arrested a second 19-year-old man on suspicion of murder.
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A prison officer - who was allegedly assaulted by a prisoner at a crown court - has died.
Large plumes of black smoke could be seen coming from the boat which caught fire while anchored on the River Thames.
London mayor Boris Johnson is under pressure to issue health warnings about his new double decker bus during the heatwave.